Rechargeable battery working for 80-100 hours *Working Voltage: D.C.3.7V *Working Current: ≤0.8 mA *Item Size: 1.6 x 1.8 x 1.2cm
Please Note: Adjust volume to the minimum before wearing. Choose an earplug of slightly bigger size to avoid whistler. Increase volume gradually to avoid sudden increase in sound. If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage. Keep the ear plug clean. Remove the battery if you don't use it for long time.
Trade Terms and Conditions:
Payment terms: Paypal,Western Union,MoneyGram,T/T available
Lead time: 3-5 days
Shipping way: DHL/FedEx/TNT/UPS,or By air,by Sea-shipping