Key benefits Secure, remote control of one electrical circuit using authorized phone calls — no app required. Flexible access management: grant up to 200 phone numbers, organized into groups with timelimited permissions. Clear feedback and monitoring: the device sends SMS confirmations after actions and can report device status regularly to the primary user. Robust build for reliable operation: metal housing with protection class IP30 and quadband GSM support for wide cellular compatibility. What it does Accepts up to 200 authorized phone numbers. Numbers can be organized into groups; each group can be assigned specific time windows during which those numbers are allowed to operate the relay. One relay output that closes when an authorized phone call is received from a permitted number and automatically opens (disconnects) when the configured time elapses. Sends an action SMS to notify the user after the relay has been controlled by an authorized number. Periodically uploads the device's current status by SMS and sends that status message to the first (primary) user on the list. Key features and specifications Access control: 200 authorized phone numbers with groupbased time restrictions. Relay: single output, closes on incoming authorized call, opens automatically at the preset time. Notifications: action confirmation SMS after relay control; configurable regular status SMS to the primary user. Cellular: quadband GSM 850/900/1800/1900 MHz for broad network compatibility. Construction: metal housing, protection class IP30 for mechanical protection and durability. How this solves common problems Eliminate the need for onsite operation: control a gate, pump, or circuit remotely by phone call without installing dedicated software. Prevent unauthorized use: groupbased time limits let you restrict when specific people can operate the relay (for example, daytimeonly access for contractors). Know what happened: automatic SMS confirmations and periodic status reports reduce uncertainty and the need to call back or visit the site. Typical applications 1) Remote gate or door control — allow visitors or service personnel access by phone only during scheduled windows, and receive an SMS confirming gate activation. 2) Agricultural pumps and irrigation — enable field staff to start pumps remotely during permitted times while ensuring automatic shutoff and status reporting. 3) Small facility or equipment power control — provide timed remote control for HVAC, lighting, or other equipment and get regular status updates to the primary operator. What to expect in operation An authorized user calls the device from a registered number; the relay closes immediately and will stay closed for the configured duration, then open automatically. The device sends a short SMS confirming the action to the controlling user. The device can be set to send periodic status SMS messages to the first user to confirm operational state. Reliable compatibility and materials Quadband GSM (850/900/1800/1900 MHz) ensures operation across most cellular networks. Metal housing with IP30 protection provides a durable enclosure suitable for indoor or sheltered installations. Note Up to 200 authorized numbers can be organized into groups with timebased control settings. One relay output only; timing and SMS reporting functions operate per the configured settings.