Spare wheel for Kinyo Wise-Calm: a highly efficient and silintious electric tyrant perfect for mothers who want to extract their milk in a comfortable way, also offers an alternative to breastfeeding when health issues, such as breast gum or sore nipples, make breastfeeding difficult. Wise-Calm is easy to operate even with one hand and you can choose the most comfortable suction level by operating only one command. It can be used either by connecting it to the current, or by the batteries (not included). Technical specifications: Brand: Kinyo Model: Wise-Calm Material: Polypropylene (PP), silicon, ABS Color: Yellow Main Pump Size: 13*11*5 cm Power supply: 4 * AA batteries or Adapter Power input: AC100 ~ 240V, 50 / 60Hz, 0.3A Output power: DC 6V 1A 12W Suction power: 130~320mmHg, 17~42Kpa, Level 9 Adjustment buttons: On/ Off/ Pause, Mode Conversion, Control Level of Suction (plus or minus)