Hydrostat for float-free ERB ЕВ-10 EB-20 and EB-20 SVDR Capsule (Saracom, Korea). Full description is HERE

FEATURES
- Complies with the latest SOLAS and IMO resolutions and COSPAS-SARSAT recommendations
- Compact size
- Two years service life after installing

The G-5 needs no annual service, maintenance or spare parts.
You simple install a new one every two years and dispose of the old one.