Manufactured in tough, high impact, water resistant polypropylene
10 number memory store of up to 18 digits each
Last number redial for up to 21 digits
In-built memory support battery
Indicates line polarity
More than 20KO of high impedance monitoring circuit prevents corruption of data travelling on the line during test
Push button keypad with loop disconnect and DTMF dialling
Microphone mute and audible ringer
Earth break and time break recall
Protected by resistance to raw 50 volt supply