Function: call function, voice control, support music Channel: Mono How to use: earplug style Color: PP bag (black), PP bag (white), boxed (black), boxed (white) Communication distance: more than 10 meters (under barrier-free conditions) Talk time: 3-4 hours Standby time: 120 hours Music time: 3-4 hours Battery type: polymer battery Battery capacity: headset battery capacity 50AM Support protocol: HEP\HSP\A2D\AVRCP Speaker material: copper ring speaker 8mm Process material: ABS Packing specification: 110*90*30mm Single packing weight: 28g for a single set