Velleman vm144 telephone ring detector with relay output module
Velleman telephone ring detector kit velleman vm144 the velleman telephone ring detector module means you can see as well as hear when someone is trying to call you ideal for use in noisy environments like factories and workshops the ring detector is also an obvious solution for the hard of hearing connected in parallel with a phone line the units powerful led flashes whenever phone rings the telephone ring detector is also available in kit form velleman vm144 telephone ring detector