Features: Pump head is easy to dismantle and clean and maintain. You can control the flow direction by connection between positive electrode and negative electrode. Buckle style design: just a click, easy to take the pump head up and away, very conveniently replace pump tube and cleaning work. Snap design only with the touch of a hand pump head can be removed very easy to replace. Suitable for aquarium, chemicals, liquids, dosage of additives. Specification:Material: PlsticColor: Green Electricity: 80mAWorking condition: Temperature: 0 to 40 degrees; Relative humidity <80%Flow rate range: 0 to 200 ml / minRange of rotation speed: 1 to 500 rpmDimensions of the drive: approx. 27.6 x 37.9mm (diameter / H)Dimensions of the head of the pump: approx. 31.7 x 20.1 mm (diameter/H).The diameter of the tube: internal diameter: 2 mm; outer diameter: 4 mm.Package List:1 * Dosing Peristaltic Pump