ImmersionRC LapRF 8-Way Personal Race Timing SystemAlso known as LapRF V2. Best in class RF Race Timing System for races with 1 to 8 pilots. Nothing else on the market compares with this, period. The passing of a quad through the start finish gate is precisely measured using the energy emitted by the 5. 8GHz video transmitter on the quad, no external hardware required. Check out all our Lap Timing and Race Gates Collection and the rest of our ImmersionRC Products! What's new ? PoE Interface The 8 Way