Brand: Remax Model: RB-S1 Material: silicon Transmission Distance: =10m Working Voltage: 3.7V Impendance: 32O Speaker Power: 280mAh Charging Time: 1.5H-2H Calling: 8-10H 280mAh large-capacity battery, 180-days Standby, 20-hours playback. Supports TF card playback, wireless earphones and MP3 player.