Audible (85dB) and visible (LED) alert
Range: 3.3ft to 13ft
On/off switch provided
Transmitter: 9V DC / 50mA max.
Receiver: 9V DC / 20mA max.
9V battery holder and adapter jack included
Transmitter: 2.2 x 1.6"
Receiver: 3.9 x 2.0"
Not recommended for outdoor use
Applications: announce visitors, warn against burglars, set boundaries, for science projects, etc.