The Freelap Pro BT 102 kit allows athletes to time runs over a set distance from either a Fly-in or stationary start. Data is sent instantly to a smartphone or tablet. Simply open the MyFreelap App on your device, attach the BLE chip to your waist, set the first transmitter to start, the second to finish and start your run. All data is saved to the MyFreelap App. The easiest timing system on the market. To add a split time all you require is an additional Tx Junior Transmitter. Have a friend or a training group, all they need is an additional Freelap BLE chip. Kit comes with 1 x Fx Chip BLE 2 x Tx Junior Transmitters FX Chip BLE Dimensions: 36 x 48 x 14mm Weight: 17g Technology: Bluetooth smart (BLE) Compatibility: Tx Gate Pro, Tx Touch Pro, Tx Junior Pro, Tx Pro Track, Tx H2O Pro, Tx FullTrack Pro, PowerUnit (with Tx Unit65 / Tx Unit3), CxUnit, LED Display Accuracy: 2/100 of a second Memory: 10 LAP Battery: CR 2032 Battery life: 2000 hours Water resistance: 5ATM Operating temperatures: -20 ° C to +50 ° C Tx Junior Transmitter Accuracy: 2/100 seconds Features: Low Battery Indicator, Auto-off Detection Distance: Athletic 31″ (80 cm) radius Battery: 2 AA alkaline (included) Battery Life: 300 hours Weight: 218 grams with batteries Dimensions: 15cm x 11.25cm x 11.25 Environment: Water Resistant Contents: TX Junior Pro Transmitter, 2 AA alkaline batteries Warranty: One year