Look no further. Excellent product quality， that's solidly built. Best of all， its very affordable price. Buy this instant. <br />Model: SD-548B <br />Brand: SUNDING <br />LCD screen <br />Material: engineering plastic and electronic components<br />Size: 46mm x 45mm x19mm <br />Power supply: 1.5V (AG13 x 1) <br />Cable length: 800mm <br />Note: Please install the magnet as close as possible to the sensor， or the values will keep jumping. <br />Wheel perimeter setting: <br />1. Set according to the wheel perimeter of bicycle <br />Speed: <br />2. Instantaneous vehicle speed SPD<br />3. Maximum driving speed MXS<br />4. AVS average driving speed<br />5. Compared with the average speed <br />Wheel rotation:<br />6. Wheel running laps per minute R<br />Mileage (inch / metric switch): <br />7. Driving with a total mileage ODO<br />8. Single Mileage DST<br />9. Set the initial value of total mileage. If you replace the battery， you can set the current value to the initial value before replacement. <br />Time:<br />10. Driving Duration TM<br />11. Clock (12 hours / 24 hours switch) CLK<br />Auto-switching<br />12. ODO， DST， MXS， AVS， TM， R， CLK function. The content will be scrolling-dispalyed automatically every 4 seconds. SCAN<br />Driving data sampling:<br />13. Instant data sampling， professional tests， including DST TM AVS MXS<br />Power saving:<br />14. It automatically enters power-saving mode and displays time only when there is no input signal in 30 seconds.<br />Maintenance reminder:<br />15. It displays a spanner symbol to remind you to maintain your bike when the total mileage reaches the set maintenance value. <br />16. Waterproof<br />1 x Bicycle computer <br />1 x Magnet <br />1 x Ties kit <br />1 x Data cable <br />1 x English user guide <br />In original package<br /><img src="http://img6.eachbuyer.com/x6/p56/wn94_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x6/p56/wn94_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x6/p56/wn94_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x6/p56/wn94_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x6/p56/wn94_5.jpg" />