•【4 Working Modes】Choose from sound only, flash only, sound + flash, or sound + steady light, light mode doubles as a nightlight. •【Memory Function】Remembers your last chosen ringtone even after power is off, no need to reset. •【Self-Powered Button】No battery required for the transmitter, generates energy with each press, ensuring reliability at all times. •【Bright Lights & Loud Sound】Clear, adjustable volume with bright LED lights, ideal for elderly or people with hearing impairments. •【Strong Signal & Easy Setup】Up to 150m remote range, stable connection with simple plug-and-play installation, perfect for home, office, or large spaces. Specification: •Receiving distance: 150m (open area) •Volume: 4 levels 0-100dB •Ringtones: 58pcs •Rated voltage: AC 110-240V, 50-60Hz •Working frequency: 433MHz •Receiver standby power: