... Raio : >48dB Lens: 3.6 x 2.7mm~ CH1 =2,414GHz ; CH2 =2,432GHz ; CH3 =2,450GHZ ; CH4 =2,468GHz~ Built-In Rechargeable Lithium Battery , AC-DC ... in MicrophoneMonitor Specification: 1. 2.4GHz wireless recordable receiver, USB2.0 port.2. 2.414GHz, 2.432GHz, 2.450GHz and 2.468GHz 4 channel receiving ... and video output such as video recorder etc.6. 2.4G ~ 2.4835 GHz belongs to S frequency range, which is ...