Welcome to our shop Here are the features of our Doorbells and Chimes: - Material: ABS - Color: Black - Receiver voltage: AC110-240V - Bell: 38 polyphonic ringtones optional - Volume: 4 files - Waterproof: IP44 (transmitter) - Remote door range: 300m in open area - Transmitter power supply: 12V23A alkaline battery (not included) Please note that this package includes 1 button and 2 receivers. The wireless doorbell is smart and has a plug for easy installation. The LED doorbell also comes with a 300M waterproof transmitter. Note: 1. Please allow small size error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. (Customer satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will try our best to provide you with satisfactory after sales service) Thank you for meeting me.I hope this helps you. Wish you a happy life.