Built in high sensitive Knowles Microphone Built in 3V CR2032 Li-ion socket.. Up to 200m transmitted range Built in Antenna Easy to operate Specifications: Outputpower3 dBmModulation WFMFrequency433Mhz +/- 3MHzMicrophoneInternal (Knowles microphone)Antenna100m-300mVoltage3Vdc CR2032
UHF Voice Transmiter Module