32 OHM Black 100m Bluetooth V4.0 Noise Cancelling Wireless Heasets with Micphone High resistance, power amplifiers loading ability stronger Bluetooth Version:Bluetooth v4.0+EDR dual mode, support2.1+EDR-V3.0+EDR Microphone Sensitivity : -453dB Have A2DP/AVRCP high quality stereo audio transmission and remote control protocol Cable and Bluetooth automatic switching, support 3.5 mm audio input