Description: Material:Plastic Diameter:3cm 100% brand new and high quality 4 digital code,only the user can unlock. Adopt micro-computer technique,have Hight-Middle-Lower sensitivity choose. Quiver trigged,security and sevsitivity. Easy to installation and DIY. Package Includes: 1 * Bicycle alarm 4 * screws 2 * Nut 1 * Use Instruction Not Incluede the Battery Note: Default code " ABCA" Code Change. When unit not work. Press 'A' for 3 seconds and you will heart a short ' Di' sound, input old code, you will heart a 'DiDiDi' sound if correct. Then you should input your 4 digital now code not later than 5 seconds, you will heart a 'DiDiDi' sould if success. Neight you input the wrong old code or failded to change the code, you will heart long 'Di' sound. Then you should repeat the process. If take out the battery excced 30s. it will go back default code automatic. Default sensitivity: middle Sensitivity adjust. When the unit not work, press " C " and hold on until you hear( you should loose your hands after you hear each sound): Di=High sensitivity; DiDi=middle sensitivity ; DiDiDi=low sensitivity Set alarm. Press " B " for 3 seconds, you will hear a ";Di" sound then the unit will work after 5 seconds delay. Relieve alarm. Input your 4 digital code then you will hear a " DiDiDi" sound if correct. If input wrong code, you will hear a long "Di" sound. The key pad will be locked for 3 minutes if you input the wrong code 4 times in succession, and will resume 3 minutes later. When triggered alarm had already sounded for 5 times, If triggered again within 5 seconds , it will sound continuously for 15 seconds. I'm sure so powerful function must can protect your bicycle effectively
