The Freelap Tx Touch Pro transmitter is designed for block starts and three-point football starts. The Tx Touch Pro transmitter is compatible with both the Freelap Watch and FxChip. The athlete places a thumb on the transmitter, and as the thumb comes off the transmitter, the watch is triggered. The Tx Touch has a CR2032 lithium battery that is rated for 15,000 starts. The accuracy is 1/100 seconds. The Tx Touch has a solid construction and is water resistant.