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. Introduction to product key operation: 1.Plug the product on the car charger, and it starts work 2.Voice adjustment: to pre the "DN" button and "UP" button shortly. 3.City Mode/High way mode: (High way mode is the default setting): to pre "MENU" button shortly. 4. Exchange of Language: to pre "MUTE" button for about 10s. Exchange between English and Ruian Specifications:Product material: plasticProduct weight: 100gProduct size: 95*60*30mm/3.74*2.36*1.18"Working voltage: car cigarette lighter 12VWorking current: 230mAWorking temperature: -30 to +70CDisplay type: Digital tube displayReminder type: live voice promptLanguage type: English and RuianApplicable models: universalPacking: OPP bagFull frequency radar band:X band: 10.525 GHz 100 MHzK band: 24.150 GHz 175 MHzK band: 24.125 GHz 175MHzKa Band: 34.700 GHz 1300MHzKa Band: 33.400 GHz 1300 MHzVG-2 11.150GHz175MHzNotes:1. There may be slight size deviations due to manual measurement, different measuring methods and tools.2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.Packages:1 X Car Radar Detector1 X Power Cord1 X Anti Slip Mat1 X Manual