Type:horseshoe lock Material:aluminum alloy, aluminum alloy Size:210*145*48mm Item name:public bike sharing mode:bluetooth, GPRS, GPS Battery:Polymer lithium 8000mAh App system:customized IOS&Androage:bike rental solution Waterproof Level:IP67 Feature 1:Gps tracking Feature 2:Anti-theft. Alarm sensor OEM &ODM:Available