GD-04A Back-up module

The GD-04A back-up module, which provides David with the ability to work approx. 12 to 24 hours continually without an external power supply.

Back-up module

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GD-04K Versatile GSM communicator and controller

The GD-04K versatile GSM communicator and controller allows you to remotely control various appliances and report statuses at the same time. It can be controlled remotely by means of a mobile phone with an SMS message or by ringing.