This especially designed
housing contains a back-up battery which enable the GD04 to
be a battery powered GSM dialler.
The GSM dialler
can be powered by the battery for 12 to 24 hours in the case
of mains power failure or where no mains power is available.
The exact period
of battery life depends on the relay status and on the GSM
signal strength.
Buy Extra GSM
battery packs to recharge and swap over to continually
monitor remote sites and locations without any mains power
or telephone landlines.
< Please click on the product links for full
information.