It seems like you're looking for a replacement laptop charger for an Acer laptop with the specifications 19V, 3.42A. Here's what you should look for to ensure you get the right charger:

Key Specifications for the Charger:

1. Output Voltage (19V): This should match your laptop's requirement. Most Acer laptops use a 19V charger, so make sure the output voltage is 19V.
2. Current (3.42A): This is the amperage required. The charger should provide at least 3.42A, but you can go for a higher amperage (for example, 4A) as long as the voltage is still 19V. The laptop will only draw as much current as it needs.
3. Connector Type: Acer laptops usually have a round barrel-type connector. Be sure to match the connector size and polarity with your laptop's charging port. Common sizes for Acer laptops are 5.5mm x 1.7mm, but you should double-check the size.
4. Power (65W): Multiply the voltage (19V) by the current (3.42A) to get the total power, which is approximately 65W. A charger rated at 65W or higher will work.