Thank you for viewing our products. Instant purchase is welcome. Thank you. [7 Colors of Light and 38 Selectable Melodies] When the doorbell transmitter is pressed, a call sound will ring, and at the same time, a 7-color LED lamp will flash to notify you. This is very convenient for the elderly or those with hearing impairments. You can choose from 38 melodies. If there is no sound from the receiver, you can solve this by pairing it with the transmitter. Method: Press and hold the volume button on the receiver, then press the transmitter to pair. Alternatively, you can contact the store's customer service directly. [Waterproof & Dustproof & Energy-Saving Design with No Batteries Required] The self-generating transmitter requires no batteries, making it economical and energy-saving. The doorbell push-button transmitter has an IP44 waterproof rating and excellent waterproof and dustproof properties, allowing you to use it comfortably outdoors or in the bathroom. [200m Wireless Range & 4-Level Volume Adjustment] This doorbell set uses a highly sensitive receiver, allowing for stable reception through walls, wooden doors, steel doors, etc., and can be used in two-story buildings. Wireless communication can reach a long distance of up to 200 meters in an unobstructed area. You can rest assured even in a large house. Ideal for nursing care, etc., notifying you from a distance with the chime. [Easy Installation] No wiring is required with the wireless chime. There is no need to replace batteries, and the doorbell receiver simply plugs into an outlet. The transmitter is fixed to the door frame (can be attached with double-sided tape), and the chime plays when the button is pressed. Installation is easy and simple. Children and the elderly can also use it. Our wireless chime is useful in homes, bathrooms, nursing care facilities, restaurants, as well as offices and warehouses.