Card-activated Power Switch — The device controls the room’s main power supply: it turns ON the power when a valid card (typically a MIFARE / RFID card) is inserted, and turns OFF power when the card is removed.

Works with MIFARE 13.56 MHz Cards — Most such energy savers accept standard MIFARE-type hotel/room cards as the “key” to activate power.

AC 220 V Operation — Designed for mains voltage supply (typical of household / hotel room wiring).

High Load Capacity — Can handle substantial electrical load (lights, air conditioning, appliances) — e.g. many models support up to 30–40 A, or power up to several kilowatts.

Automatic Power-Off When Room is Vacated — As soon as the card is removed (guest leaves), the device cuts the power (sometimes with a configurable delay of a few seconds), preventing unnecessary electricity consumption.

Simple Installation & Integration — Often built to fit standard wall-switch boxes (e.g. 86×86 mm module size), making retrofit or new install straightforward.

Energy & Cost Savings – Reduces Wastage — By ensuring that electricity only flows when the authorized card is inserted (i.e. when someone is present), these devices can significantly cut down wasted electricity for lights, air-conditioning, fans, etc. This is especially beneficial for hotels, guest houses, or shared accommodations.

Improved Safety & Convenience — Since power is automatically cut when the occupant leaves, there’s less risk of appliances being left on accidentally (reducing fire hazard or overheating). Also, for users, it’s a simple “insert card” / “remove card” mechanism — no need to manually switch many appliances off.