Here are the specifications for the Acer laptop adapter you described:
- **Brand:** Acer
- **Power Output:** 39.9 watts (19V * 2.1A)
- **Voltage:** 19 volts (19V)
- **Current:** 2.1 amps (2.1A)
- **Connector Size:** 0.7mm
This adapter is designed to provide power to Acer laptops that require a 19V power supply with a current rating of 2.1A and use a connector with a diameter of 0.7mm. It's essential to verify compatibility with your specific Acer laptop model before purchasing to ensure it will work correctly.
You can typically find this information in your laptop's user manual or by checking the label on your current adapter. When purchasing a replacement adapter, ensure it meets safety standards and is compatible with your laptop model.