Wireless Doorbell by 5 Core Waterproof Doorbells & Chimes Wireless Kit Over 200 Meter Range, 58 Doorbell Chime, 4 Volume Levels with LED Flash Wireless Doorbells for Home, Offices, warehouse. PRODUCT FEATURES: 1. -58 ring chimes to choose 2. -Adjustable volume with 5 options from 0db-110db 3. -650 feet/200 meters wireless distance 4. -LED indicators 5. -Battery powered for button, plug powered for receiver, easy using 6. -Learning code technology, convenient DIY SPECIFICATIONS: 1. Receiver voltage: AC 110V-250V 2. Transmitter button battery:12V 23A alkaline battery 3. Volume range:0-110db 4. Working frequency:433.92±280KHz 5. Working temperature: -15?-60?/5?-140? 6. Working range:650ft/200m Easy SET UP: 1. Plug the receiver into a socket and fit the transmitter on a door or wall with the accessories 2. provided; including 2 screws set and a piece of double-sided adhesive tape. 3. 200M AMPLE WIRELESS RANGE: 4. 1 plug-in receiver included1 battery powered transmitter; the 433Mhz frequency makes them 5. work correctly, No interfering with other equipment, No missing signal. 6. 58 CHIMES TO CHOOSE FROM Stereo speaker 7. Delivers rich and crisp sound 8. 58 adjustable volume levels with a maximum setting of 110 dB; press Forward or Backward button to easily choose from 58 melodies. 9. HIGH PERFORMANCE TRANSMITTER: Ultra-low power consumption uses a 12V 23A alkaline battery that boasts 12months lifespan. 10. IP44 dustproof and waterproof rating; works between 5°F to 140°F; withstands various harsh weather conditions. MEMORY FUNCTION: Remembers your last melody and volume level after a power outage; no need to reset your previous settings; convenient and easy-to-use design for an enhanced user experience.