Worldwide Free Shipping On Order Over $30, 30-Days Money-Back Guarantee
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      • Model: UiiSii K8
      • Style: Ear Hook
      • Style: In-ear
      • Communication: Wired
      • Connectors: 3.5mm
      • Line Length: 1.2m
      • Vocalism Principle: Hybrid technology
      • Frequency Response Range: 20-40000Hz
      • Sensitivity: 104±3dB
      • Resistance: 16Ω
      • The horn outer diameter: 10mm


      Hi-Res Certificate                        Manual

      Terms of Payment

      We accept credit card payments (Visa, MasterCard, American Express, Discover and more), for credit card payments it is support by stripe. Another security payment method is PayPal (PayPal express checkout).

      As a rule payments are processed instantly, however, depending on the payment method and the banking system, sometimes the payment processing may take up to 2-3 business days. 

      Kindly note, as we are not charging payments directly - it may take some time to be processed through the payment systems. In most cases it takes few hours , but can take up to 5 business days. 

      We cannot accept liability for payments being recorded on the wrong account if you supply inaccurate information, but will make every effort to reallocate any such payments if they arise. We cannot accept liability if payment is refused or declined by your credit/debit card supplier for any reason.

      Note: All your money are protect security by PayPal and Stripe. We supuort 30 money back guarantee after you receive our products, check our Shipping&Return Policy

      For more question check our FAQs

      Shipping&Return Policy



      Our shipping teams sole goal is to get your orders processed and dispatched to you in the shortest amount of time. Orders are processed in the morning every Monday to Friday.


      • We support standard shipping by country local post office.
      • Free shipping for order up to $30
      • $5.99 shipping fee for per order less than $30
      • India&Bangladesh all through post express shipping cost 6.99$
      • Please confirm the standard shipping has a probability of being checked by customs for this situation need to customer deliver small tariffs.


      • We usually by DHL/Fedex priority shipping.
      • Priority shipping with 3 - 7 day delivery available to most location, prices vary by location and displayed at checkout.
      • For order value is higher than $60, we suggest choose fast shipping that delivery success rate is guaranteed.

      How Long dose It take an order to my country?


      North America(USA,Canada, Mexico)

      10-20 days

      Australia & New Zealand

      10 - 20 days

      All Europe

      8 – 15 days

      Japan, Singapore & S. Korea

      7 – 10 days

      Rest of Asia

      10 - 20 days

      South America

      20 – 35 days

      Other regions

      20 – 30 days or more.


      North America(USA,Canada)

      5-7 days

      Australia & New Zealand

      5 – 10 days

      Asia 3-5 days



      The shipping choices available from our Site's online store are estimates and do not guarantee the date of delivery. In no event will we be liable for any loss, damage, or penalty resulting from any delay in shipment or delivery. Your package will be processed using the selected shipping method, typically within 1-2 business day of your order being been approved (depending on Product availability and the time of day your order is submitted). After your package has been shipped, you will receive an email containing a shipping confirmation, tracking number and carrier information. In order to avoid any additional return shipping charges, make sure that a household member is there to receive your package. 

      Packages returned to our fulfillment centers, due to incorrect addresses will be subject to return shipping fees. 

      Orders are not processed or shipped on the weekends and holidays. Weekend days should not be considered when calculating your delivery date. 



      • If you can't receive your products due to incorrect address we don't take any responsibility and we don't give a refund.Please double check all information before confirming your order.
      • Days are expressed as working days which are Monday to Friday, and does not include weekends or regional public holidays. 
      • During festive periods, please allow more time for delivery. We do apologize for the inconvenience caused.
      • During certain peak shopping seasons, or during large sales, processing and dispatch time may increase.
      • Tracking is provided on most shipments; not always will online tracking be available.



      You can track the progress of your order in 2 ways:

      Track using your EMAIL address and ORDER NUMBER using a carrier tracking number (if you received one) 

      Alternatively, shipments can be tracked at Aftership


      We're proud of the products we design. 

      For products purchased directly on, we offer a 30 Day Guarantee to ensure your happiness. The 30 day period begins upon the purchase date of your order.Returns will only be accepted if labels and original packaging are fully intact. cannot accept returns where labels have been removed.

      Furthermore, and due to health and hygiene reasons, you have no right to return in-ear products if such product’s packaging has been opened, meaning that the packaging seals are broken.

      You are responsible for the shipping of returned items back to Items lost in transportation will not be compensated for.

      Shipping charges on returned merchandise are at the customer’s expense. However, will not charge additional shipping on exchanges. Refunds for returned merchandise will be made within two weeks of the return of the product, to the original purchaser’s credit card. Note that additional duties and/or taxes will not be refunded. Neither will shipping costs. All exchanges are subject to availability.

      Faulty items will be exchanged to the same type of product in the same size, subject to availability. Refunds for faulty items can be made within the 30-day period following delivery.

      For exchanges and returns send an email to

      For products purchased in-store or from third party online resellers:

      If in the event you purchased a Uiisii product from an in-store retail location or from another online retailer, the 30 Day Guarantee does not apply. Please review our Warranty policy.


      Customer Reviews

      Based on 13 reviews
      The ear buds are comfortable, the sound is great

      The ear buds are comfortable, the sound is great, it is easier to pack and carry, and it blocks out all unwanted noise. What more could you want. Don't waste your time and money on anything else, BUY THIS PRODUCT! As soon as I am done with this review, I am going to buy a set for my wife. FANTASTIC PRODUCT, and CAN'T BEAT THE PRICE. The little case is also great!! i recommend.

      Hi Scott Ingerson,I'm glad to hear that you like the headphone of K8.Customer support is our driving force for progress.We will try our best to bring you a better music experience.

      The quality is excellent

      Appearance, beautiful, nice sound, satisfied with the order. The price is very affordable. The quality of this product is beneficial to the seller. Very satisfied. Thanks to the seller.

      Hi Sonoma vines,I'm glad to hear that you like the K8.Customer support is our driving force for progress.Thank you for your support Uiisii,We will try our best to bring you a better music experience.Have a nice day!


      The quality is excellent, there are basses. thanks to the seller

      Great sound, durable construction

      They passed the ultra-deep bass test. Treble is crisp. The bass doesn't have the *wow* factor, like my VAVA dual-driver bass earbuds, but it is almost as ear-hair vibrating. 😊 I love the construction! That gets an AAA+++ from me! The wires look like they are encased in a fine steel mesh, under the outer silicone layer, which is super-important, as much as I use earbuds - hours daily, every day (I have 2 pairs, because I spend my time at 2 different houses...don't have to worry about forgetting to take my earbuds with me, just leave a pair at each place). The noise cancellation is excellent! Nice zippered carrying case, extra buds of several definitely get your money's worth!

      Hi Billy Joe,Thank you for taking the time to share your thoughts about UIISII headphones. Customer support is our driving force for progress.We will try our best to bring you a better music experience.
      I love these

      These are great. I bought them for college as the dorms can get loud when I want to study or sleep, and they block out most background noise. No, it is not completely noise canceling, but they are not full ear enclosing or super expensive quality like 100% noise canceling headphones. Even if I do not have any music playing at all I often don't even realize my roommate is trying to talk to me or that there is a commotion in the hallway, and they sound great. The wire feels like it is metal but coated in a plastic which makes them feel very durable. 10 out of 10, would recommend.