1) The battery life of the button is up to 1 years (calculated 10 times a day). 2) Long-distance open and barrier-free 300 meters/984FT has strong penetration performance, and indoor obstacles are about 20~60 meters. 3) Equipped with 60 pieces of music, 5 levels of volume, and the receiver has up and down song selection keys, making the operation more convenient! 4) The host has a large metal speaker, which sounds pleasant to the ear! The volume is about 85-97dB, 5) Application occasions: Used as a wireless doorbell or call reminder in homes, villas, schools, companies, hospitals and other places.<br><br>Supports the use of multiple sets of doorbells, Press any button, the receiver ringtone will sound, and each button can be set with a different ringtone to distinguish visitors. Colour:White Material:ABS+Electronics Power Supply: 3 x AAA batteries(Not included batteries)<br><br>Package Contents: 1 * receiver 2 * transmitter<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.