Specifications:

Protocol:a2dp/avctp/avdtp/avrcp/hfp/spp/smp Frequency
Range:2402MHz-2480MHz
Transmission distance: outdoor straight line distance 10M
Battery capacity: polymer lithium battery 50mah
Charging box battery capacity: 650mah
Listening to music time: 3hours Up and down music / pause playback
Service time: making telephone 4-7 hours,playing music 3-5hours
Standby time: 10-15days
Charging time: About 2H Charging: 5V /500mA Standby current: 4uA