15V 36W USB-C PD Power Supply for pi-top [4]. USB-C Power Delivery specification at 15V for faster battery charging. Comes with interchangeable US, UK and European plugs. Please note: Your pi-top [4] will NOT work with most USB-C power supplies you might already own. You must use a power supply with USB-C Power Delivery specification at 15V, with minimum 30W for maximum accessory compatibility.