1)100-1800m 4ch 4in4/8out cctv amplifier 2)3 Poles Pre-emphasis 3)100-1800m Distance 4) ... Equalizier350MHz Broadcast Video Bandwidth, Hum Bar Rejection, 3Poles EqualizierGround Loop Isolation, Brightness & Sharpness Combine (BSCTM) ADJ 14dB Gain, HF Compensation, 4CH ... /50~60Hz, 12VDC(optional) 100-1800m 4ch 4in4/8out cctv amplifier