The wireless mic offers professional full band audio 44.1~48kHz stereo CD quality, more than 6 times the frequency of conventional mono microphones. Support Multi-Channel Real-Time Mixing, it can synchronize the background music for phone and human voice in real time【Universal and Performance Wireless System & Portable and Durable】The Receiver Powered by Phones, the Transmission Microphone Built in Rechargeable Batteries Up to 6 hours Operation Time. 【Plug and Play, NO APP or BLUETOOTH is needed 】Easy to use, switch on and plug in the receiver to connect automatically Lapel Microphone is different from others. Ours includes transmitter and receiver (with work range up to 65ft ) they will automatically connect, so APP or Bluetooth are not required .