Transmiter looks like it hasn't been used but it's battery was faulty so was replaced witth new Varta 1/2AA. I don't have any tanks or dive computer  to test it but it looks good to me. When I replaced the battery green led blinked a couple of times. You'll get what's in pictures.

Compatibility:

This transmitter is compatible with the following Suunto dive computers:

 • D9

 • D9tx

 • DX

 • D4i

 • D4i Novo

 • D6i

 • D6i Novo

 • Vytec

 • Vytec DS

 • Vyper Novo

 • Vyper Air

 • HelO2