Features: Up-dated intelligent flash light design brings convenience to the hearing handicapped Ultra-distance represents the techonlogy of surpassing obstacles Wireless easy mounting design never affects your inner decoration and makes the doorbell anywhere you like Energy saving design of environment protection Easy to Install, no wiring required Specifications: Model£º9530FD Input Voltage: DC3V Power Supply: 2 * AA battery(Not included) Multimusic Sound: 36 melody music Package includes: 1 * Remote control wireless door bell 1 * Doorbell button