Features: External wired doorbell, perfect choice for security access control system. Featured with a clear, loud and soft "ding dong" ringing sound. Premium ABS plastic material, anti-oxidation, anti-discoloration for maximum durability. Great performance and high reliability, ensure excellent alarm function. Two installation methods of wall-mounted and double-sided adhesive tape, easy and convenient.    Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: Power supply voltage: 12 (V) Type: Doorbell  Package List: 1x Door Bell