PIR Technology: The infrared sensor detection range is about 4-8m and the maximum operating range is 280m. You can place the infrared sensor detector at the entrance, porch, gallery, mailbox, and place the receiver in your home. It detects motion and sends a wireless signal to the receiver, so you can always understand the situation and ensure safety. 5 Modes to Choose: The receiver has welcome, alarm, doorbell, color light and night light modes. 5 welcome languages can be selected in welcome mode. There are 36 ringtones in doorbell mode to meet your needs. There are up to 113dB alarms in alarm mode, which effectively helps prevent intruders. The color light/night light mode is silent, 4 levels of brightness and color are selectable, very suitable for people with hearing impairments or sleeping babies at home. Easy to install: The device can be charged by USB or installed with batteries for better operation. Both the infrared sensor and the receiver have a mounting base. The infrared sensor can rotate 360 degrees left and right, and 180 degrees up and down. It is very easy to install and can be rotated to any position you need. More expansion: Each receiver of the motion detection alarm can be used with up to 32 motion sensors. The number of transmitters and receivers can be arbitrarily selected, can be freely matched, and special lights or ringtones can be set to each other. Multifunctional motion detector: Wide range of applications. It can be used as a doorbell, caregiver pager, burglar alarm, pet monitor, mailbox alarm, store welcome bell, it can be successfully used in your home, hotel, hotel, office, warehouse, office buildings, etc. White color Quantity delivered: 1 piece (1 host + 1 sensor)becomeveryrich