Attention: Welcome to my shop! We ship the product from China, the delivery time is 7-14 days! product description x 2.4GHz wireless transmission x Outdoor distance up to 200 meters x 3.5-inch display screen, camera with shaking head function, 120 degrees up and down, 355 degrees left and right x Two-way intercom x Invisible light night vision function x Temperature display / built-in probe x Temperature alarm x One-to-four function (one receiver can be connected to four transmitters) x Image zoom in and out x Image digital panning x Multiple transmitter image preview function x Power saving mode (voice activated) x Cui Mian song playback x Adjustable volume and brightness x No signal alarm x Low battery alarm x Large capacity lithium battery 950mAHProduct parameters:Frequency: 2400-2483.5 MHzImage sensor: 1/6 CMOSCMOS pixel: 640 x 480Frequency: 2400-2483.5 MHzTFT LCD screen: 3.5"Effective Pixels: 320x240Demodulation Mode: GFSFrame rate: up to 25 fpsPower Adapter: Input: 100-240 V, 50/60Hz Output: 5 V, 600 mA Built-in lithium-ion battery: 1200mAhStandby time: up to 15 H in eco modeTransmission power: 181dBmCurrent consumption: 100 mADisplay color: full color Working range: up to 300M (without blocks)Operating temperature: 0 - 40CHumidity: 5-90 percent RHpack:1x receiver x 1x transmitter x 2x Power Adapter x 1x Instruction Manual x 1x Wall Mounting Screw x 1x screw plug