General description Wireless self-powered doorbell that requires no batteries, utilizing self-generating technology. It features multiple music ringtones and adjustable volume, ensuring a strong signal over long distances. This energy-saving and environmentally friendly doorbell is designed for easy installation and use, enhancing home security. Installation Take out the product and plug the indoor unit into a power outlet. Check if the blue indicator light on the indoor unit is flashing. If the blue light flashes, the indoor unit is functioning normally. Press the call button on the outdoor unit transmitter to test if the indoor unit rings the doorbell. If the indoor unit rings during the test, the product is working correctly.