Simply pair these awesome new, compact and convenient True Wireless Stereo Earbuds with your phone and experience loud and clear sound! When you’re done listening, simply pop them back into the case to charge. Next time you use the Earbuds they will immediately and automatically pair with your deviceABS & aluminiumCharging Case: 5 ( l ) x 5 ( w ) x 2.7 ( h ) cmEarbuds: 1.5 ( l ) x 2 ( w ) x 2.3 ( h ) cmBluetooth version: 5.0 + EDR wireless support playback from smart phones , tablets or most other Bluetooth compatible devices 15m visible distance for playing music, 10m visible distance for calling Recharge via USB cable ( included) Case lithium polymer battery (380mAh)Earbuds lithium polymer battery (40mAh)Stand-by time: 180 hours Charge time: 1.5 hoursPlay time : 3.5 hours “