Raymarine Tacktick MicroNet T121 Wireless Hull Transmitter

Sends Data from Transducers to Instrument Displays via Wireless Link
Power: 9 ~ 24 Volt DC, Integral Lithium Battery with 300 Hours Autonomy
Simple Color ~Coded Connections, Watertight Construction
Raymarine T121 Wireless Hull Transmitter

Features:
Functions include:
Boat Speed
Depth
Compass
Sends speed, depth and compass transducer information to Raymarine instrument displays via wireless link
Can be installed in any convenient location on the boat, but usually close to transducers
Simple color ~coded connections
Watertight construction
For multihulls, advanced Micronet technology allows your displays to use wind direction to automatically determine which hull transducer supplies the information you need ~ no switches required
In the box:
T121 Hull Transmitter

Specifications:
Raymarine Model No. T121
Operating Voltage: 9 ~ 24 Volt DC / integral lithium battery with 300 hours autonomy
Dimensions: 4.33 inch W x 4.5 inch H x 1.22 inch D
Note: 2 hull transmitters required for this configuration