[55 melodies and 5 volume levels] high quality wireless doorbell with the most stable music chip with 55 built-in melodies for clear and pure sound. You can easily hear it at home when the ringtone rings. The memory function can be used to select sounds and bells. [waterproof and intelligent LED design] the wireless outdoor doorbell made of waterproof material is IP55 and guarantees stable performance for outdoor use. Blue LEDs on the buttons and receiver are a visual indication for hosts and visitors. [Widely Used] Wireless doorbell kit for home, apartment, school, villa, office, warehouse, hotel, factory, hospital, etc. Stereo speakers provide rich and clear sound, flashing light indicators easily perceptible to people including the hearing impaired. Battery Free