● Unified design bicycle with specified number and chip tag to indentify individual bicycle 。 ● Anti-rust aluminum alloy frame could last for 10 years of use。 ● Adjustable anti-thief saddle with waterproof, suitable for 140cm_190cm riders 。 ● Down tube design for better riding safty。 ● Internal 3 gear shifting to prevent collision damage 。 ● Auto lock for dock parking。 ● Front light, back light, reflection sticker。 ● Anti-thief design with front and back mudguard。 ● Bicycle with bell, mobile lock and basket。