BLTWO X13 Bluetooth Headset Detachable Earhook For Cellphone Tablet Black+Red Voice Remote: Say "Yes" to answer the call; Say "No" to reject the call. Support multi-connect two bluetooth devices at the same time. Support and limited on iPhone to Display the Battery Level of the Bluetooth Earphone. Echo Suppression,Noise Cancellation,Voice Prompts. Wireless Technology: Bluetooth 4.0 +EDR. Talk: 6-8 hours; Standby:100 hours; Charging time:2 hours.