You need an adapter to connect the charging cable of your Samsung smartwatch to the wall socket. You can find 2 types of adapter here. Check whether your charging cable has a rectangular USB-A connection, or an oval USB-C connection. Then, choose a charger with either a USB-A port or a USB-C port. Choose a charger with multiple ports if you want to charge other devices at the same time as your smartwatch. Keep in mind that you'll only buy an adapter here. To charge your Samsung Watch, you also need a Watch charging cable.