Description Wireless and battery-free doorbell Outdoor Waterproof IP 65 Snow Rain Humidity [NO BATTERY = PEACE OF MIND]: Why choose a battery-free system? It's well known that batteries don't like humidity, freezing temperatures, or extreme heat. Rest assured, fully suitable for outdoor use, the battery-free wireless doorbell is absolutely not afraid of extreme weather conditions. [DON'T MISS YOUR PARCELS]: Another delivery notice in the mailbox? Or a customer who's getting impatient because you're in the storeroom? 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-powering mechanism that is reliable, robust, and efficient. In addition, the extended antenna gives you an excellent range that can pass through walls and slabs without any problem. ECONOMICAL AND ECOLOGICAL: No need to have a stockpile and a battery at home,