How to Pair? Power on:Press “Power”for 3 seconds until the red-blue light flashes Power off:Press “Power” for 3 seconds until the indicating light is off Bluetooth pairing: 1.Turn on your device bluetooth function,search “C40” and to be connected. 2.They will automatically connect to your bluetooth device when you use again Bluetooth Earphone Parameters 1.Bluetooth version:V4.1 2.Protocol:A2DP/AVRCP/HFP/HSP [...]