The Akyga AK-ND-42 is a car laptop power adapter designed for Lenovo laptops, delivering 20 V / 4.5 A and 90 W via a Slim Tip (Lenovo square) connector. It connects to a 12 V cigarette lighter socket and features a DC-to-DC power supply type with a 1.1 m + 0.55 m cable. The adapter includes a ferrite core, soft start technology, and multiple protections (OVP, OTP, OPP, SCP, OCP) for safe operation.