Bluetooth Wireless Stereo Sport Headphones (Red ) &hellip; Workout Headphone Studio headphones:Providing steady Bluetooth signal and support stereo APT-X loss less music1.If couldn't turn on the headset please check whether are in full charger. 2.Bluetooth Profiles: A2DP, AVRCP, HSP, HFP 3.Transmission range: About 10m(33Feet) 4.Charger indicator: Red LED light(charging/power off) Blue LED light(charging completed/power on) Red and Blue alternating(pairing mode)