7 Light Colors & 38 Heads to Choose From: Press the doorbell transmitter and 7 LED light colors will flash to alert you when there is a call. It is very convenient for the elderly and those who do not have free ears. You can choose from melodies and 38 songs. A wireless doorbell that is very convenient thanks to light and sound notifications, and can be found immediately in an emergency. Water & dust resistant & battery-free energy-saving design: The self-powered transmitter does not require batteries, making it economical and energy-saving. The doorbell button transmitter for calling is IP44 waterproof specification with excellent waterproof and dustproof performance, easy to use even outdoors or in the bathroom. 200 Meters Wireless Range & 4-Level Volume Adjustment: This doorbell call kit adopts a high-sensitivity receiver, which can stably receive walls, wooden doors, steel doors, etc. and can also be used for a two-story building. Wireless communication in open places up to 200 meters long. It can be used safely even in large houses. Suitable for places such as nursing homes, far from China. Easy Installation: Wireless doorbell, no wiring is required. No need to replace the battery inconvenience, just plug the doorbell receiver into the socket, you can fix the transmitter on the door frame (double-sided tape) to press the button to ring. Easy to install. Children and the elderly can use it. The wireless home doorbell can be useful not only in your home, bathroom, nursing site, and restaurant, but also in offices or warehouses. Versatility and quality assurance: It can be used in various situations as a call button for the elderly, pregnant women, and physically vulnerable people, a doorbell for visitors, contact in a store or office, care site, bathroom, call in a warehouse, etc. If there is any problem with the item, please contact us and we will replace it with a new product or refund you.