LED indicator and Voice indicator: When Mid LED indicator is always on and with continuous buzzing sound, the position is the center of the laser line. If the position deviate from the center, Up and down indicator is on and with discontinuous sound.

1.The receiver is used at a distance when the laser beam cannot see the laser line.

2.Danponlaser the receiver USES a frequency of 300Hz, and the laser module is also 300Hz

3.The receiver power supply is 2AA batteries