Look no further. Excellent product quality, that's solidly built. Best of all, its very affordable price. Buy this instant. <br />Model: SD-548C <br />Large LCD screen <br />Head size: 46 x 45 x 19 mm <br />Power supply: 1 x 1.5V AG13 battery <br />Transmitter voltage: 12V <br />Fuctions: <br />1.SPD - CURRENT SPEED<br />2.ODO - ODOMETER <br />3.DST - TRIP DISTANCE<br />4.MAX - MAXIMUN SPEED<br />5.AVS - AVERAGE SPEED<br />6.TM ELASPED TIME<br />7.CLK CLOCK (12H/24H)<br />8.SCAN -AUTO CYCLE　<br />9."＋""-"COMPARATOR<br />10.SEETING SPEED SCALE (KM/M)<br />11.SEETING TYRE CIRCUMFERENCE (0mm-9999mm) <br />12.SEETING THE LAST VALUE OF ODOMETER<br />13.FREEZE FRAME MEMORY<br />14.AUTO ON/OFF<br />15. WIRELESS TRANSMISSION <br />Note: This odometer is equipped with a ball-bearing switch. Please shake it when it is in dormant state. Then it will turn on automatically when the ball-bearing switch senses the vibration. <br />1 x Bicycle computer <br />1 x Support <br />1 x Transmitter <br />1 x Connection part <br />4 x Ties <br />1 x English user guide <br />In original package<br /><img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_1.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_2.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_3.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_4.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_5.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_6.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/286/415/607415286/img/agdetail.image-gmkt.com/286/415/607415286/img/img6.eachbuyer.com/x6/p56/wo01_7.jpg" />