Wireless and battery-free doorbell Outdoor Waterproof IP 65 Snow Rain Humidity [BATTERY-FREE = TRANQUILITY]: Why choose a battery-free system? It is well known that batteries do not like humidity, negative temperatures and high heat at all. Rest assured, totally suitable for outdoor use, the battery-free wireless doorbell has absolutely no fear of extreme weather conditions. [NEVER MISS YOUR PACKAGES]: Another notice in the mailbox? Or a customer who is getting impatient because you are in your store's stockpile? And yes... bad luck, the batteries in your wireless doorbell are still dead, and of course, it always happens at the wrong time! [INCREDIBLE TECHNOLOGY] : Guaranteed operation every time! We use a state-of-the-art self-feeding mechanism that is reliable, robust and efficient. Also, the extended antenna gives you an excellent range that can pass through walls and slabs without any problems. [ECONOMIC AND]: No more need to have a stock and battery at home, save money with your