Multi-channel adjustment: three-frequency adjustable (irregular; dialing; stable)
Utrasonic button: when you press &hold the button, it will emit an utrasonic sound that can only be heard by dogs. The Led indicator light up red when the device is working and emitting utrasonic sound.
Beep button: when you press the button, it will make a beep sound. it can be used to get a dog attention.
Torchlight button: when you press the button, the flashlight will be turned on. Keep pressing this button, and the flashlight will switch between three modes until it turns off.
25 khz high frequency ultrasound: Can Blow Out Candle