Garmin Descent Mk3i With T2 Transceiver TransmitterComes with Garmin T2 Transceiver Transmitter Immerse yourself in the Descent Mk3i watch style dive computer for a heightened diving experience. With versatile dive modes, SubWave sonar technology for diver communication, and support for monitoring tank pressures and depth for up to eight divers (with the Descent T2 transceiver), this device offers enhanced functionality. Additionally, a built in LED flashlight ensures visibility in low light