Simply plug the MSB into any available mains socket on the premises to obtain audible indications of approaching persons.
If necessary, more than one MSB may be used in different locations around the premises.
The MSB will operate both day and night while any lighting will only operate at night.

SPECIFICATION:
220/240 volts 50Hz
Internal fuse. Non replaceable
86 db output
Pulsed tone 2Khz approx.
Duration 3-4 seconds on each activation
Internal use only