Siam Circus Digital LCD Display Bicycle Computer Odometer Cyclometer Display: Two-line four window displays. Power by : 1x 3V CR203 Lithium batteries ( Battery included ) Package Content: 1 x Bicycle computer, 1 x Mounting Shoe, 1 x Sensor, 1 x wheel Magnet, 1 x Cable ties, 1 x CR203 battery, 1 x English Instruction Note: This item comes without retail box. Ship out within 4 days.