1 Dingdong doorbell. Ding Dong doorbell size: 6 3.8 2cm. Doorbell size: 13.5 5.2 3.5cm. 1 Doorbell. Wireless connection: WIFI IEEE802.11b/g/n 2.4GHz, rf 433MHZ. High definition night vision: Equipped with LED lights, it automatically switches to night vision mode at night, and you can see clearly without lights.
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