Alternity - Tides of War
The special frequency-angle transceiver inside this micro-thin headset can cover the entire lower part of the electromagnetic spectrum below microwaves. Comm gear has a 1,000 kilometer range for surface communications, and can reach into high planetary orbit to contact base ships.
For an extra $100, an encryption device can be included to scramble and unscramble signals as needed. A charge cell for the device costs $25 and lasts for 30 days regardless of how often the comm gear is used.