Allows you charge your Surface devices via 45W 15V3A USB-C Power Delivery (PD) wall charger or power bank, you only need to bring a USBC charger to charge many devices including Surface on the go. It is very lightweight and portable. It can also be used as a spare charger. Requirement: This cable requires an USB-C charger or charging bank that support 45W 15V3A output. Doublecheck your USBC charger to ensure that it lists "15V/3A" in the specifications. Some PD chargers didn't support the cable, most phone charger wouldn't support the cable. Compatibility: Microsoft Surface pro7/6/5/4/3, Surface Laptop1/2/3, Sruface Book1, Surface Go1/2/3. This cable is compatible with Surface Pro 8/9 Surface Laptop 5, but due to technical limitations, the system will show "Slow charger is connected", but the power is enough that you can work and entertainment normally.