B004 - Ääniohjattava rele. Säädettävä herkkyys. Käyttöjännite 9VDC.

* This acoustic switch works with a microphone and a relay. *Whenever there will be any kind of noise (e.g. ringing of a telephone, doorbell etc.), the relay will switch on, and if the noise stops, the relay will switch off. *With the aid of this device you may activate in other rooms bells, lamps, etc. *Ideal for persons with hearing problems, for rooms with high ambient noise levels, as acoustic alarm system etc. *The pick-up sensitivity is adjustable. *Operating voltage is 9 Volt.