Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

Description:Feature:-Good performance of high-decibel loud sound， one-button press to attract attention and alarm the walkers-Also with anti-theft function， alarms & vibrates with loud sound when bike be shaken-Password controlled， default password is "0000"， its password is changeable-Waterproof and mini design， convenient and practical， fit for bicycle， electric bike and etc.Specification:Mounting-Pipe Diameter: Approx. 2.5cmDefault Password: 0000Power Supply: 4 X AG13 Button Battery ( Included )Material: PlasticSize: 6 * 4 cm ( Length * Diameter )Weight: 100gColor: Black Usage: Anti-theft Mode-Long-press "0" for 2 seconds， 1 second later， "Dee" 1 sound be heard; 2 seconds later， "Dee， Dee" 2 sounds heard， then undo the press， after 3 seconds， "Dee--" 1 long sound will be heard， and the Anti-theft Mode is ON.-When bike be shaken， it alarms for 15 seconds， then stops， while the Anti-theft Mode is still ON.-To delay the Anti-theft Mode， please first long press the Alarm Button， then enter the password; To turn off the Anti-theft Mode， please directly enter the password.Password's Changing-Long-press "3" for 3 seconds ( "Dee" sound be heard )， enter default password "0000".-"Dee， Dee" 2 short sounds be heard， then enter your new password ( 4 digits ).-"Dee" 1 long sound be heard， repeat your new password again.-"Dee， Dee" 2 long sounds be heard， the new password is available.