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 or 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 or 6 CMOSCMOS pixel: 640 x 480Frequency: 2400-2483.5 MHzTFT LCD screen: 3.5