Electric dilator: It has electric quantity display function. When the electric quantity is lower than 20%, the alarm is displayed (red), the body is equipped with LED light; equipped with power adapter, it can be directly connected to 220V AC power supply; the maximum opening distance is ≥720mm; the maximum expansion force is ≥50KN ( The tip of the expansion arm is about 70mm down); the mass is <24Kg (without battery).