Designed for apartments hotel rooms, this hard-wired 24 volt DC doorbell notification kit comes with everything you need to alert Deaf hard of hearing people to someone at the door. Includes (1) single gang backlit doorbell push button with mounting plate (1) combination horn/strobe (1) power supply Features Doorbell push button includes a white backlight, making it more noticeable easier to locate Choose between 5 different strobe colors 5 different audible tone options SW1 rotary dial controls the strobe (Off, Amber/Yellow, Clear/White, Green, Blue, Red) SW2 rotary dial controls the sound (Off, Chime Continuous, Chime Temporal, Horn Continuous, Horn Temporal, Doorbell/Ding Dong) Expandable ? the switching power supply can power up to 5 additional horn/strobes for alerting in multiple rooms The notification mounting bracket can be mounted universally to single gang, double gang, 4 square, and many more boxes. Specifications Notification appliances meet ANSI/UL 464, ANSI/UL 1971, and UL 1638. 24VDC power supply rated for 1.0A, 110/220VAC input, =/- 15% Power supply includes an enclosure and has an operating temperature range of -20 ~ +70C Doorbell is mounted on a single gang SS plate with flying leads on the back Input terminals accept 14 to 18 AWG wire Nominal voltage 24VDC Unit Dimensions: 5? (12.7 cm) high x 5.0? (12.7 cm) wide x 2.0? (5.08 cm) deep Product compliance with NFPA 72, IBC/IFC/IRC Feature Details Brand Hear World Mfg part # HW-LDHSK2 UPC N/A Warranty 3 Years Color White Item Dimensions 5" x 5" x 2" Weight (lbs) 2.55 Battery operated? No Batteries included? No Battery details N/A What's included? (1) Combination horn/strobe (audible visual), (1) Power supply, (1) Single gang backlight doorbell push button plate Country of Manufacture United States System (no system / stand-alone) Alert Type(s) Vibration Flashing Light Loud Audible Low Vision / Deaf-Blind No Yes Yes Yes Transmitter / Receiver Transmitter(s) and Receiver(s) Alert Trigger(s) Baby Cry Carbon Monoxide Mobile / Smartphone Doorbell / door knock Motion Pager / SOS Phone / VP Smoke / Fire Sound Severe Weather No No No Yes No No No No No No Expandable Yes Portable No Battery backup No USB charger No