1. Speaker: 52mm*2 4Ω5W*2 THD+N 10%. 2. Sizes: 72×74.7×210.3mm. 3. BT specification: BT V5.0 JL. Support protocol A2DP, AVRCP, HFP. Weight: 471g. 4. Function: support BT playback, calls, FM, TF card, USB, AUX playback mode. 5. Calls / music time: 5 hours or more (80% volume playback). 6. Battery capacity: 1200mAh, charging time is about 2 hours.