Bluetooth Version:V4.1 Chip:CSR8635 high quality stereo sound frequency transmission and long -distance control protocol Stand-by Time :200h Holding time :5h Play music :4h Charging Time :1h Frequency Rage :2.402G-2.480G Charging Voltage :DC5V 300MA Ambient Temperature :-20℃/+60℃ Transmission Distance :10m battery Capacity :55mAh connect 2 mobile phones