BRAND NEW-NEVER USED OR REMOVED FROM THE PACKAGE. The Track Interface (SITS02A) is a system having the job to interface the Live Timing Box (SITS01A) to the sensors (DS bridge, dead strips...) which are on the track. In particular, it elaborates the signals given by the sensors so that they can be read by the Live Timing Box (SITS01A), allowing the latter to carry out the expected functions, such as: lap time playback and time and telemetry data storage. Each Track Interface (SITS02A) is able to manage the signals coming from two lanes, up to a maximum of two sensors per lane (e.g. a dead strip and a DS bridge), allowing the user to choose the lao counter sensor and the sector time sensor. SLOT-IT PARTS ARE HEAVY DUTY AND WERE DEVELOPED FOR HIGH PERFORMANCE AND ENDURANCE USAGE AS WELL AS GIVING A SMOOTH AND PRECISE DRIVE TRAIN. THE PARTS ARE OF THE HIGHEST QUALITY AND BEAUTIFULLY FINISHED. ALL PARTS SHIPPED IN THE UNITED STATES ARE INSURED YOU ONLY PAY SHIPPING FOR THE 1ST PART PURCHASED AND ALL OTHER PARTS HAVE FREE SHIPPING AND YOU CAN EVEN MIX OR MATCH PARTS LIKE TIRES, WHEELS, GEARS AND MORE ................ WILL SHIP WORLDWIDE- WITH A MULTI ITEM SHIPPING DISCOUNT. FREE SHIPPING FOR PARTS WHEN THEY SHIP WITH A LARGER ITEM SUCH AS A CAR OR SET. WE ACCEPT PAYPAL, VISA, MASTERCARD, DISCOVER, AMEX ....................                                                                                                                          MULTI ITEM SHIPPING DISCOUNT.