Name :wireless dingdong bellBrand :SafulModel No. :TS-K108 2V1Discription:wireless doorbell, ding dong voice, 2 outdoor unit, 1 indoor unitGross Weight :0.21KGPacking Size :packing size:10.6cmx8.5cmx7.5cm G.W. 0.21kg 40pcs/CartonFeedbackNew wireless dingdong bell !!1V1, 1V2, 2V1 for choices !Product IntroductionThis product is a smart doorbell which is unlike the traditional wireless doorbell. It is simple & easy to operate, has stable transmission signal, fit for apartment, villas, home, hospital and many other places.This product is according to the rules of the frequencies using of our country. It won’t produce harmful electromagnetic interference.Please carefully read the use manual to correctly grasp the installation, operation methods.Features1. simple design, elegant, chic style;2. ultra-low-power design, energy saving and sustainable use3. 300 m long distance remote control, stable signal;4. 36 polyphonic ring tones for optional;5. Adjustable indoor ring volume.Technical parametersTechnical parametersIndoor receiverOutdoor transmitterVoltage RangeAC:110V-220VDC12V 23AAlkaline batteries*1Operating temperature-10℃-55℃-20℃-65℃Transmission distance 300 meters in open areaOperating Frequency 433.92MHz±200KHzVolume 25-110dBPower 0.1WOperate Instructions1, volume adjustment,Shortly press the volume button for once,the volume will increase a grade, total 3 grade,It will change in cycle.2, music selection