Feature:1. Flashing Doorbell: With LED light indicator, our flashing doorbell is suitable for the elderly and the deaf, providing both visual and tactile cues.2. Adjustable Light Color: Seven flash colors are available, which can be selected according to the sensitivity of the deaf, but also to add color and vitality to the family.3. Wireless: Our doorbell systems require no wiring installation, no battery replacement, and can be easily installed anywhere in the home, very convenient.4. Adjustable Volume: The doorbell has an adjustable volume to ensure that the elderly with poor hearing can clearly hear the doorbell even at a distance.5. Remote Tranmission: The strobe doorbell uses wireless signal transmission to provide greater coverage and ensure you don't miss visitors.Specification:Item Type: Flashing Doorbell (delivered with supporting battery)Material: ABSSize: Approx.10 x 7 x 5cm / 3.9 x 2.8 x 2in Battery Type: Button batteryBattery Model: cr2032Battery Quantity: 2Battery Capacity: 480mAh.Package List:1 x Receiver 1 x Transmitter 1 x Screwdriver 2 x Batteries 1 x Screw Set 1 x Instruction Manual1 x Gasket