PRODUCT DESCRIPTION: 1. Receiver: 110-260 (V) 2. Transmitter: no battery 3. Minimal power consumption when idle 4. Weight: 205 grams 5. Temperature resistance: -20 to 55 C 6. Volume: 4 volumes (0-110DB) 7. Optional ringtones: 51 music 8. Working range: up to 150 meters in the open space 9. Package contents: transmitter/receiver/double-sided tape/screw kit/Polish and English user manual 10.Color: black, white feature of product: 1. The doorbell without battery adopts modern design, is very easy to install, very environmentally friendly, and very suitable for residential and office use. The range of the device is 150 meters 2. Long transmission distance, up to 150 meters in open areas 3. Waterproof IP44 transmitter 4. Low energy consumption and long service life 5. Easy to install and fast to use 6. Battery-free design, more environmentally friendly