This is a plug-in type continuous suction device. Connectors for connecting to things like melatubes are not included, so please purchase them separately. Although it is in a clean condition, it has been used for about a month. I am selling it because I no longer need it. *Please be sure to attach the dedicated tube and plastic bottle before use. There are 3 sets of tubes and bottle caps to connect to the plastic bottle. You can adjust the suction strength. I cannot provide instructions for the device, so please purchase this device if you understand it. 【Specifications】 Maximum air intake: 3,000cc per minute Water: 650cc (Maximum suction pressure: -11kPa) Electricity bill (approximate): Approximately 90 yen for continuous use for one month Power supply: AC100V Power consumption: 4.5W (60Hz) / 3.6W (50Hz) ▼To use the low-pressure continuous suction device for a long time, if saliva accumulated in the plastic bottle or water droplets in the tube are sucked into the pump, it may cause a malfunction and you will not be able to use it for a long time. You can reduce the risk of suction with the following methods, so please try them. Tube processing Process the capped tube and connect two plastic bottles. The second bottle acts as a safety bottle, reducing the risk of overflow. Size of plastic bottle Use a large plastic bottle. Also, to prevent foamy saliva from being sucked in, adding a small amount of water to the bottle will lower the viscosity and be effective. Type of plastic bottle Use a hard plastic bottle. Soft plastic bottles may collapse and deform due to suction pressure. Pump position Condensation may occur in the tube due to temperature differences. To prevent water droplets in the tube from being sucked in, it is recommended that the pump unit be installed higher than the user's head.