LJC 1km RC FPV Combo System Kit 5.8Ghz 600mw Transmitter Receiver NO blue Monitor 800TVL Camera for DJI QAV250 CX20 DIY Quadcopter With 7-inch 800 * 480 high-definition digital screen, brightness 300CD About the detected video signal display time 0.5S (when the receiver signal bad that snowflake display, the signal completely disconnect that blue screen again detected signal that display immediately, there is no delay) Voltage Range: 7-35V (recommended 3S battery-powered) Supports two-way AV signal display, (AV1 and AV2,AV1 can be used to connect receivers, AV2 connected DVR, AV1 do enjoy watching the picture,AV2 used surveillance DVR working state, the screen of a key switch AV1 / 1V2) Screen comes with sun shade, easy to carry