Features:
* Soft start and soft stop function.
* Manual operation in case of emergency power outage.
* Alarm lamp (optional), infrared to improve safety performance.
* One-button operation: On-Off-Off, simple and fast.
* Automatic door closing and single door switch function.
* Can be connected to Bluetooth system, credit card system, etc.
* Backup power supply (optional), still working when power is cut off
https://www.chinaautomaticdoor.com/automatic-door-gate-operator/dc-buried-door-opener.html