[BATTERY-FREE = PEACE]: Why opt for 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 is absolutely not afraid of extreme weather conditions.[DON'T MISS YOUR PACKAGES]: Another notice in the mailbox?Or, a customer who is impatient because you are in the reserve of your store?And yes... bad luck, the batteries in your wireless doorbell are always dead, and of course, it always happens at the wrong time!INCREDIBLE TECHNOLOGY: Guaranteed to work every time!We use a state-of-the-art self-feeding mechanism that is reliable, robust and efficient.Additionally, the extended antenna gives you excellent range that can pass through walls and tiles without any problem.ECONOMIC AND ECOLOGICAL: No need to have a stock and a battery at home, save money with your battery-free chime kit.In addition, by avoiding battery changes, you are making an ecological gesture by avoiding the long and complicated recycling of cells and batteries.[EASY AND QUICK INSTALLATION]: No complicated programming or other dangerous manipulations.Choose the location of your doorbell, plug the chime into an electrical outlet and that's it.Then you can choose the ringtone volume level and melody that suits you.