DJI Mic 2 Wireless Lavalier Microphone Dual Set 2 TX / 1 RX (CP.RN.00000324.01)

Microphone frequency: 50 - 20000 Hz
Equivalent noise level: 21 dB
Maximum sound pressure (1 kHz): 120 dB
Connectivity technology: Wireless, Devices 
Interface: Bluetooth system
Maximum operating distance: 250 m
Product colour: Black
Audio output: 3.5 mm
Power source: Battery
Battery type: Built-in battery
Battery Technology: Lithium Ion