Applications announce visitors, warn against burglars, set boundaries, for science projects,...

Specifications: Audible (85dB) and visible (LED) alert, range 3.3ft to 13ft + on/off switch provided, power supply transmitter 9V DC/50mA max., receiver 9V DC/20mA max, 9V batt. holder and adapter jock incl., dimensions transmitter 2.2” x 1.6”, receiver 3.9”x 2.0”, not recommended for outdoor use