Proofreading and Editing of Technical Manuals

Original text:

To connect the device, plug it in to the charging port. Make sure that the device is fully charged before use. Once the device is charged, power it on by pressing and holding the power button for 3 seconds. The LED light will turn on indicating the device is powered on.

Edited text:

Connecting the device

1. Plug the device in to the charging port.

2. Ensure that the device is fully charged before initial use.

Powering on the device

1. Press and hold the power button for three seconds to power on the device.

2. Observe the LED indicator light turn on, indicating that the device is now powered on.