Features: brand new and high quality GSM Quad-band, can work in the worldwide GSM networks, Optional 4G No call charges. The GSM Gate Opener rejects the call from authorized number, then the relay will turn ON/OFF on the first ring One output with relay （3A/240VAC）for connecting the switch of the door or machines The relay action will return a SMS confirmation to the owner, this function is editable One wired switch:we can control it under manual control mode Based on GSM/4G Network, applied to many application(gates, bollards, barriers, garage doors, shutters and access doors or machines) Specifications: Material: ABS Weight: 200g Size: 61.5x85x25mm/2.42x3.34x0.98inch Package Includes: 1x Gate Opener note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.