| External wired doorbell, ideal choice for access control system Premium ABS plastic material, eco-friendly, waterproof, flame retardant. Anti-oxidation, anti-fading for maximum durability. 12V Doorbell Red: +12V, Black: GND, Green: BELL1, Yellow: BELL2. With high -90dB speaker. Featuring clear, loud and soft "ding dong" ringing sound. Ringtones: 3 chords to choose from. With Dingdong ring. Suitable for access control system, such as home, hotel, office, apartment, factory, etc. Features: 1) ABS material. Small and beautiful, can be used for a long time 2) External wired door bell for security access control. 3) Featuring soft, loud ding dong and clear playing bell sound. … | |