... 5cm x7.5cm package weight: 0.17kg 40pcs/CartonFeedbackNew wireless dingdong bell !!1V1, 1V2, 2V1 for choices !Product ... is a smart doorbell which is unlike the traditional wireless doorbell. It is simple & easy to operate, ... -10℃-55℃-20℃-65℃Transmission distance 300 meters in open areaOperating Frequency 433.92MHz±200KHzVolume 25-110dBPower ... , total 3 grade,It will change in cycle.2, music selection