18 ( l ) x 15 ( w ) x 7.5 ( h ) ABS & PU supports playback from smartphones, tablets or most other Bluetooth compatible audio devices Bluetooth version 5.0 10m visible distance • built-in microphone supports call pick-up 200mah with lithium battery • charge time: 2 hours • playback time: 4 - 6 hours frequency response: 20 hz -20k hz • sensitivity: ?85db