2.4G hz receiver and 2 cameras, four channels, with remote contr

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2.4G frequency lock, four channel with remote control, open distance is 50-100m, china manufacturer specifications: receiver: receiving frequency:2.4G frequency lock, four channel with remote control, receiving sensitivity:-85db, open distance: 50-100m, power adapter:dc12v/500ma, size(mm):120*100*28, camera: image device:1/3 cmos(ov7940), can select channel by manual pal:628(h)*582(v); ntsc:510(h)*492(v), horizontal definition:380 line, minimum illumination:1 lux/f1.2,Open dinstance:50-100m, power adpater: dc8v/500ma, size(mm):60*60*128