1. Self-Powered Technology: No need for batteries or charging cables - the doorbell generates power every time the button is pressed, ensuring continuous operation without the hassle of replacements. 2 .Long-Distance Reception: Reliable signal transmission over long distances, ensuring you never miss a visitor even if you're in a different room or floor. 3. Easy Installation: Quick and simple setup - no wiring required, just mount the button and receiver where you want them. 4. Adjustable Volume: Choose the right volume level to suit your needs, ensuring you hear the chime clearly without it being too loud. 5. Multiple Chime Options: Select from a variety of chime tones to personalize your doorbell experience. 6. Power outage memory function. 7. Compact Size: Compact and , making it ideal for small spaces or discreet placements. 8. Long Lifespan: Built to last, with minimal maintenance requirements, ensuring years of reliable service. Specifications: Input Voltage: 110-240V AC Operating Distance: Up to 150 meters (outdoor) Volume Levels: Adjustable (8 levels) Chime Options: 36 selectable ringtones Wireless Frequency: 433.92MHz Maximum Transmitter Pairing: 10 Transmitter Size: Φ55x20mm Receiver Size: Φ60x23mm Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. voltage: AC220V Colour:White Material:ABS Package Contents: 1 * Doorbell 1 * Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.