No Airtime Charges: Open barriers and doors with door openers, or turn machines on or off, simply by dialing an authorized user number. Reject calls from authorized numbers, then perform an on/off operation. Security: use caller ID for identification, ignore unknown calls; operate anytime, anywhere, without distance restrictions; add or delete users through SMS commands; no need to provide remote controls for different purposes; up to 999 phone numbers can be configured. Relay switch: relay with rated output, used to connect door or machine switch; relay action will return SMS confirmation to the owner, this function can be edited by the user; relay closing time 0000-9999. Protect Your Assets: Two digital inputs for door contacts, motion sensors or other sensors used to secure doors and windows, when any of them are triggered, an SMS alert message will be sent and the siren will be activated immediately If you need to pass low cost The solution protects your assets, which is very useful. Wide application: based on GSM network, suitable for various applications. Examples include , bollards, guardrails, garage doors, shutters and access doors or machinery., Manufacturer: DMETE