[No Battery = Peace of Mind]: Why choose a battery-free system? We all know that batteries don't like humidity, freezing temperatures and intense heat at all. Rest assured, it is perfectly suited for outdoor use, the wireless doorbell without battery is definitely not afraid of bad weather. [Don't Miss Your Package]: Another delivery notice in your mailbox? Or, impatient customers because you are in stock in your store? Yeah... no luck, the wireless doorbell battery is dead anyway, and of course, it always happens at the wrong time! Incredible Technology: Guaranteed to work every time. We use a state-of-the-art automatic power supply mechanism, reliable, robust and efficient. In addition, the extended antenna gives you excellent coverage, passing through walls and panels without any problem. ECONOMICAL AND ECOLOGICAL: You don't need inventory and batteries at home, you can save money by using a battery-free chime kit. Also, by avoiding battery replacements, you can make an ecological