WARNING This item won't work with a PC or an Iphone as it is for an Android device!The Bluetooth microphone is a kind of professional intercom equipment for Inrico T320 T298S Zello Phone, by connecting APP of smart phone or network radio, providing truly secure link, easy pairing on the go, and instant push-to-talk. The Bluetooth microphone, as wireless accessory, is flexible and cost-effective that gives users more  mobility in their critical communication. Key Features: Answer the caII: Press Power button to answer phone when Bluetooth microphone has been activated. Decline: Double click Power button to decline when there is call in. Hang up the call: Single click power button to hang up the call. Mp3 play and pause: Single click power button to play or pause MP3 music when connected. Standby: Auto hibernation starts in 15min. When Bluetooth microphone has not activated. PTT function: Bluetooth microphone supports PTT software such as Zello, Total control and etc. PTT button can be used when it is activated. Group switch:Single dick FW button with green light on and Single click V+/V- to switch group when Bluetooth microphone is activated for PTT software. End group switch by pressing PTT button.