Package Include: 1 x Vibrator 1 x Transmitter Vibrator Parameters: Working Mode: Multiple Vibrations Working Frequency: 433.92MHz Power Supply: 1 x AAA 1.5V Battery (included) With power switch on the side. Operating Temperature: -20C to +70C Size: 51mm x 30mm x 14mm Usage: Press the button A of the transmitter, the vibrator vibrates once. Press the button B of the transmitter, the vibrator vibrates twice. Press the button C of the transmitter, the vibrator vibrates three times. Press the button D of the transmitter, the vibrator vibrates four times.