SPECIFICATION: Moddel: EA203 Bluetooth version: V5.0 Bluetooth solution: A2DP, AVCTP, AVRCP, HFP, SDP, L2CA Frequency range: 50Hz-20KHz Connection distance: 10m Impedance range: 32Ω±5% Battery capacity: 400mAh Playback time:  -10h (70% volume) Charging interface: Micro USB Support: Aux/TF card