VELLEMAN IR LIGHT BARRIER KIT (requires assembly)
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 battery holder and adapter jack included•dimensions: ◦transmitter: 2.2 x 1.6"◦receiver: 3.9 x 2.0"•not recommended for outdoor use