Soft start and slow stop, automatic shutdown, obstacle detection and automatic reverse. interface, infrared sensor, alarm light, wall button. Spare battery pins are provided for use with solar panels. The shell is made of metal, independent control unit, easy to install. Piston - For 2-panel doors, this piston driver is for large or heavy in any material and is the solution to simplify your everyday life while making your possessions more secure., Manufacturer: DMETE