Suitable for various places such as home, hotel, bar, restaurant, factory, workshop, office, tea house, catering and entertainment. Made of high-quality materials, durable. Compact size. Long transmission distance, can fully cover the working range. No need for frequent charging. Operating frequency:433.92MHz Battery:DC6V (CR2032x2) Transmitting current:10mA±3mA Standby current:Less than 1uA Open distance:Greater than 500 meters Key:1 million times Waterproof level:IPX4 Number of keys:4 keys Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC100-240V Colour:As Shown Material:Plastic Package Contents: 1 * Display 10 * Call Buttons 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.