67 ( l ) x 2.5 ( w ) x 1.2 ( h ) ABS & siliconsupports playback and call pick-up from smartphones, tablets or most other Bluetooth compatible audio devices internal rechargeable lithium polymer batteryrecharges via USB cable ( includes )Bluetooth version 4.1 10m visible distance1 - 2 hrs recharge time2 - 4 hrs playback time PS presintation case: 7.2 ( l ) x 7.2 ( w ) x 2.2 ( h )Our Allegro Bluetooth Earbuds are small in size, but big in stature with a cool magnetic on/off function that is activated by separating the earbuds (to switch on) or placing them back together (to switch off).The buds also have a built-in mic that supports call pick-up and come in stylish packaging that protects them from damage when not in use.