The new GSM AIRCRAFT PREHEATER has 2 output sockets and can be used for vaious functions. Both outputs can support up to 15amps and can be preset to activate from 1 seond up to 18 hours. You can also preset a delay bewteen relays for up to 18 hours. The GSM-Aircraft preheater uses a unique system that never costs you a penny to use. You just call the unit from anywhere and the system will activate the relays and reject the call.
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