This appliance is missing an earth wire, but it most likely has double insulation.

Appliances with double insulation have their internal parts and wirings completely insulated from the outer casing, and the outer casing will be made of an electrical insulator, eg plastic.

This means that, even if a live wire touches the casing, it will not become “live”, hence it will be safe to use even without an earth wire.

Note: Appliances with double insulation will have this symbol: