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  • AST-357 S4 Sports Bluetooth Earphone
AST-357 S4 Sports Bluetooth Earphone
  Item Description
Model Number: S4
Bluetooth Version: Bluetooth 4.1+EDR
Protocol: Supports HSP, HFP, A2DP, AVRCP
Transmission Distance: 33ft / 10m (no obstacle)
Frequency Range: 20Hz-20KHz
Impedance: 16Ω
Sensitivity: 100dB±2dB
Signal to Noise Ratio: ≥80dB
Battery: Built-in 3.7V 70mAh Rechargeable Li-ion battery
Music Playing Time: 4-5 hours (The Music Volume will affect the time)
Talk Time: 4-5 hours
Standby Time: 100 hours
Charge Time: About 2 hours
Charge Port: Micro USB
Charge Voltage: DC 5V
Color: Black, Blue, Green, Red ( Optional )
Cable Length: 65cm / 2.13ft
Main Item Weight: 17g / 0.6oz
Package size: 10.5 * 8.0 * 4.0cm / 4.1 * 3.1 * 1.57in
Package weight: 57g / 2.0oz

Package List:
1 * Bluetooth Headset   
1 * USB Cable
1 * Clip
1 * Pair of Earcap

1 * English User Manual

  About Shipment
1. WORLDWIDE SHIPPING. (Except some countries and APO/FPO)
2. Orders processed timely after the payment verification.
3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.
4. The images shown are not the actual item and are for your reference only.
5. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season.
6. If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!
7. Due to stock status and time differences, we will choose to ship your item from our first available warehouse for fast delivery.
  Return & Refund
1. You have 7 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! Shipping cost is bear by both seller and buyer in half.
2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your po#.
3. We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction. OR, you may choose to have a replacement.
4. We will bear all the shipping cost if the product(s) is (are) not as advertised.
  About Guarantee
1. 12 months Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.
2. Defective items MUST BE reported and returned within the warranty period (and in the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY.
You agree to all of the above-listed policies upon ordering on aliexpress!
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