Car automotive electronics dog working principle:when detect radar tachometer,it will iue a warning in advance.for example,when detect there have electronic eyes or speed device, it will broadcast in advance.Mobile radar Speed Monitor send different frequency, some is K,some is KA, and X etc.when the car Car Electronic Dog detect the frequency, it will tell you a sound, that is K and KA.that is mobile radar speed monitor.KA is Radar frequency.Please Note:The principle of a fixed road speedometer is to use a ground coil to measure speed, and it will not send out a signal. Only a mobile speedometer will send out a signal.This product is only valid for K-frequency or KA-frequency, and it makes warning voices only when the frequency is same as above,and when there is a hidden speed traps.but no alarm sound will be iued when the frequency is different, so not every speed measurement point will work, please purchase with caution.Features:Detect any stable or mobile radar speed monitor ahead.Detect any traffic monitor or stable camera (around traffic lights) in advance.Leading you to drive safely and avoid traffic fine.ODM and OEM Technology Service for different places and customers.English / Ruian voice warning, OEM language and voice are available.Easy installation and control, available for independent installation and use.Fully 16 bands receiver.Two versions: English version / Ruian version.Specifications:OSD Language: English, RuianInterface: Mini USB, DC charging portSpecial Features: LED displayItem Type: Alarm system and securityDetect Bands:*K-BAND:24.150GHz 175MHz, detectable distance: 100-200m*KA-BAND: 34.700GHz1300MHz, detectable distance: 50-150m*Wirele duplex transmiion frequency: 2.4GHz410MHzPower: DC 12VVoltage: 1000mASize: 120 x 62 x 35mmFunction operation:Quick Instruction GuidePlug the product on the car charger, and it starts workVoice adjustment: to pre the ldquoDNrdquo or ldquoUPrdquo button shortly.City Mode/High way mode: (High way mode is the default setting): to pre the middle button shortly.City/ Highway modes allow the user to select operating mode which reduces the frequency of false in densely populated urban areas. When traveling at highway, the device is on full alert with maximum radar sensitivity for the best poible performance. When you choose city mode, it turn down the sensitivity of key radar bands to help eliminate false alerts.(High way mode is the default setting): to pre the middle button shortly.Exchange of Language: to pre the middle button for about 10s.To make the signal only showing on the display screen, mute setting: when there is signal received and when it is making vocal alerting, just to pre button UP button shortly.Vocal alerting: to re-plug the product on the car charger. It will back to vocal alerting again from the status of mute.Package:(1) x V7 Radar detector(1)x Car Charger(1) x Anti-slip Mat