Prevent the liquid from entering the circuit board through the gap of the sticker, improve the reliability of the circuit. Side handle makes operation easier.The strong suction and saliva ejector can be turned off with a delay of 5 seconds to ensure that the dirt in tubes is completely drained.The strong suction and saliva ejector handles are made of a combination of aluminum alloy and silicone, light weight and good sealing, can be removed for cleaning and disinfection. The flow can be adjusted by the handle flow switch.