1. *Device Type:* Double bottle suction machine (electric suction apparatus with two collection jars).
2. *Key Feature Highlighted:* High negative pressure with large flow rate ≥30 L/min.
3. *Pressure Adjustment:* Stepless adjustment from 20 kPa to 85 kPa (±10 kPa).
4. *Functionality:* Visual negative pressure gauge lets patients/customers adjust suction to their required value.
5. *Components Shown:*
- Negative pressure vacuum table with dual jars.
- Pressure regulator for stepless adjustment.
- Gauge for monitoring negative pressure.