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€104.55 (Inc. VAT)
€85.00 (Ex. VAT)

GSM Alarm and Control system GSM021

The GSM021 can used to inform a maximum of two users through the GSM network that an alarm has occured. Users may also control one electrical device via their mobile phones, e.g. they may switch a lighting system on and off or open and close a gate.

GSM021 may be connected to an intruder alarm control panel. It has two digital inputs (normally open), so that one detection device may be connected independently of the intruder alarm control panel, or alternatively two detection devices may be connected to GSM021 without needing a control panel.

Either user may turn the heating or lighting on or off, open gates, lift blinds etc. by sending the GSM021 a text message. Only one electrical device may be controlled in this way. The system remembers the status of output in the case of temporary electricity failures. The system will ignore requests and calls coming from unknown telephone numbers.

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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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