It sounds like you're looking for a laptop charger for an Acer laptop with a 19V output and 3.42A current, and it has a yellow pin (possibly the specific connector type). To help you find the right charger, here are some key things to consider:

Key Specifications for the Charger:

1. Output Voltage: 19V (This is a common voltage for Acer laptops, but make sure to double-check your laptop's requirements).
2. Output Current: 3.42A (This is the current rating, which will affect how quickly the charger can supply power to your laptop).
3. Connector Type (Yellow Pin): Some Acer laptops use a specific type of connector for charging, often a round pin (center-positive). The yellow pin likely refers to the color or the design of the connector.
4. Power Rating: Multiply the voltage by the current (19V * 3.42A = ~65W). Ensure the charger provides at least this amount of power, but chargers with higher wattage (e.g., 90W or 100W) will also work, as long as the voltage is the same.