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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 Downloads - Manuals Manual_MK120.pdf (169 kB) Extra Info - Schematics receiver transmitter