• The dial uses yellow (0~300mmHg), green (300~550mmHg), and red (550~760mmHg) to  color-code low, medium, and high negative pressure zones.
• When the adjustment knob is turned clockwise, the negative pressure increases; when turned  counterclockwise, the negative pressure decreases.
• The suction unit connects to the suction bottle via corresponding standard plugs for easy  detachment.
• It features three working mode settings: FULL (fully open), REG (pressure adjustment), and OFF  (shutdown).
• The housing is made of high-strength, high-quality ABS shock-resistant material; it is cleanable  and disinfectable, durable.

Features: 

1. Primarily used for children and critically ill patients.
2. Negative pressure gauge with 360° rotation capability. 
3. Continuously adjustable negative pressure value. 
4. 4Safety bottle with anti-suction function to prevent backflow.