Bluetooth Version:V4.1 Chip:CSR8645 high quality stereo sound frequency transmission and long -distance control protocol Stand-by Time :240h Holding time :10h Play music :8h Charging Time :1.5h Frequency Rage :2.402G-2.480G Charging Voltage :DC5V 300MA Battery Capacity:130mAh Ambient Temperature :-20℃/+60℃ Transmission Distance :10m connect 2 mobile phones WITH IPX4 WATERPRROF FUNCTION