Bluetooth version: 5.0 Applicable models: All kinds of mainstream mobile phones with Bluetooth function Support protocol: A2DP,HFP,HSP Bluetooth transmission frequency: 2.4GHz Transmission range: theoretically around 10m Microphone: omnidirectional high sensitivity microphone Speaker: 40mm 32 ohms Sensitivity: greater than 85DB Frequency response: 20-20 KHz FM frequency: 87-108 MHz Suitable card: TF card (microSD card) Features Multifunctional: Wired and wireless, hands-free calling, USB charging, Bluetooth signal, wireless card playback. The Super Multifunction Bluetooth headset allows you to use your mobile phone for hands-free calls and the built-in microphone for wireless calls. It allows you to control your phone's play, pause, songs and volume control of the headset. LED display frequency function, convenient mode selection and switching songs with ease. Oversized high protein ear cups for a comfortable fit and breathable insulation from outside noise.