USB Charging: Convenient USB charging for easy power management without the hassle of battery replacement. Waterproof Design: Fully waterproof construction ensures reliable performance in all weather conditions. Extensive Selection of Ringtones: Choose from 60 different ringtones to suit your personal taste and mood. Adjustable Volume: Five volume levels allow you to customize the sound to be as loud or as subtle as you need. Long Range Connectivity: Impressive 150 meters operational range ensures you never miss a visitor, even if you are far from the doorbell. Enhance your home's convenience and security with the Smart Wireless Doorbell. This advanced doorbell system is perfect for any household or office. Colour:A:Black/B:White Material:ABS Package Contents: 1 pairs * Smart Wireless Doorbell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.