1. REMOTE CONTROL: This smart garage door opener features a remote switch and easy APP control, allowing you to make free authorized calls and operate it from anywhere with no distance limitations, perfect for global networks. 2. SIM CARD SUPPORT: Enjoy no call charges! The relay switch receives calls from authorized numbers and performs the switching action on the first 'ring'. Supports standard SIM cards only. 3. AUTOMATIC IDENTIFICATION: Utilizes caller ID to identify and ignore unknown callers. Easily add or remove users with SMS text commands. No need to provide separate remote controls or buttons for different users. 4. PROGRAMMABLE: Add or remove users via SMS text commands. The relay or opening time is programmable. Relay operation returns SMS confirmation to the authorized phone, a feature that can be forwarded without call charges. 5. WIDE APPLICATION: Ideal for group-type doors, elevators, garages, parking lots, resorts, control rooms, warehouses, unattended machine rooms, telecom operators, on-site lighting substations, on-site base stations, traffic control, and power distribution systems and cabinets.