REVEX Wireless Human Sensor Chime X850 ※Reference※ This is a wireless chime system that supports daily life by detecting visitors, people, and movement for purposes such as doorbells, caregiving calls, crime prevention, and care. It notifies you with light and sound (both are possible). The blue light shines brightly, making it easy to understand. Sold on Amazon for 12,000 yen! Detects the movement (heat) of people and animals and notifies you with light and sound in a remote location. For notifying visitors and detecting wandering elderly people. It detects the movement (heat) of people and animals and notifies the receiver in a remote location with light and a chime sound. * Batteries are not included for both the receiver (X800) and the transmitter (X50). Thank you.