【Alerts with Light & Sound】 Equipped with a high-sensitivity receiver, it boasts excellent stability with a maximum radio wave range of 150m (30m or more with walls). It can be used with peace of mind in large houses and facilities. There are 32 call melodies, and the volume can be adjusted in 4 levels. It notifies with both sound and light, making it easy to use for those with visual or auditory impairments. 【3 Operation Modes】 1. Music + Light 2. Music Only 3. Light Only (Silent) Switching is easy, just press and hold the volume button and the song selection button simultaneously. 【No Interference & IP44 Waterproof】 The transmitter is resistant to interference and enables stable wireless communication. With IP44 waterproof specifications, it can be used outdoors at the entrance or around the bathroom. 【Wireless & No Installation Required】 No wiring is required. The transmitter requires no batteries or power supply, as it generates power from the force of being pressed, eliminating the need for replacement. It can be installed with double-sided tape. The receiver can be used simply by plugging it into an outlet. 【Shape Selection】 This product is available in two types: "Rectangle Type" and "Round Type." Please select your desired shape when ordering.