Never used. The Rocketfish RF-NBAC 40W Universal AC Netbook Laptop Charger Power Adapter is a versatile power adapter designed for laptops. With a voltage range of 12-19 volts and an output current of 3 amps, it offers a maximum output power of 40 watts. Compatible with various laptop brands and models, this adapter is a convenient and reliable solution for powering your netbook or laptop on the go. The included 4 tips ensure a secure connection for a wide range of devices.