Wireless and Battery-Free Doorbell Outdoor Waterproof IP 65 Snow Rain Humidity [WITHOUT BATTERY = PEACE OF MIND]:Why choose a battery-free system? It is well known that batteries do not appreciate humidity, negative temperatures and high temperatures. Rest assured, fully adapted to outdoor use, the wireless doorbell without battery is absolutely not afraid of extreme weather conditions. [NEVER MISS YOUR PACKAGES ANYMORE]:Another delivery notice in the mailbox? Or a customer who is getting impatient because you are in the stockroom of your store? And yes... bad luck, the batteries of 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-powering mechanism that is reliable, robust and efficient. Also, the extended antenna ensures excellent range that can pass through walls and slabs without any problems. [ECONOMICAL AND ECOLOGICAL]: No need to have a stock and