"Wireless Microphone for SLR Cameras and Phones - 2nd Gen - Collar Clip Type - 1 Transmitter, 2 Receivers"

Product information:
Input level (3.5mm): -20dBV
Microphone preamplifier gain: 20 decibels
Equivalent noise level (A-weighted): 22 decibels
Power requirement: Built in rechargeable lithium-ion battery, charged via USB 5V.0.3A
Working hours: up to 7 hours
Analog input: 3.5mm TRS (lavalier microphone input)
Transmission range: 200m (line of sight)
Computer connection: USB Type-c
Operating system requirements: macOS 10.11 or higher/Windows 10 or higher