4G GSM 1CH Relay Switch RL1 — Wireless Remote Garage/Gate Opener Access Controller via SMS

Operate remotely with no distance limitation. The GSM/3G/4G LTE AC/DC Power Monitoring Alarm rejects a call from an authorized number and, on the first 'ring', returns the onsite power voltage so you can check status without call charges. Suitable for multiple uses including power status monitoring, solar panel supervision and DC voltage sensing. Supports up to 10 authorized phone numbers: 5 can be designated to receive calls or SMS, and 5 can be set to call and send SMS when an alarm is triggered. Includes one 12DC output for driving a siren or controlling other 12V DC devices.