UK Hikvision 8ch POE 4K Outdoor Security System Mic Acusense DS-2CD2183G2-IU. input amplitude: 3.3 Vpp, input impedance: 4.7 KΩ, interface type: non-equilibrium. Focal Length & FOV 4 mm, horizontal FOV: 180°, vertical FOV: 44°.
eBay