RTU5024 GSM Gate Opener Relay Switch — Quad-Band 850/900/1800/1900MHz, Long Antenna, 3A/240VAC Relay, Free-Call Door Access

Compact GSM relay controller for remote door and machine access. The RTU5024 accepts both SMS commands and authorised calls to operate a single output relay, allowing gate, barrier or shutter control without conventional remotes or keys. Key features: - User management via SMS: add or remove users with simple text commands. - Control methods: operates using caller-ID for secure call-based access; unknown callers are ignored. - Remote range: can be operated from anywhere with GSM coverage — no distance limit. - Quad-band support: works on 850 / 900 / 1800 / 1900MHz networks worldwide. - Capacity: supports up to 200 authorized phone numbers, configurable at the specified time. - Relay output: one dry contact output rated 3A/240VAC for connecting gates, doors or machinery. - Programmable timing: relay open/close duration is user-programmable. - Confirmation feedback: relay actions can send an SMS confirmation back to the owner or an authorised caller; this confirmation feature is user-editable. Typical uses include gates, bollards, barriers, garage doors, shutters and other access-controlled doors or machines.