The Garmin Instinct 3 Tactical Edition Solar (45mm, Black) is the smaller-cased, solar-charging version of Garmin's tactical rugged watch line, aimed at military, law enforcement and outdoor professionals who want a compact watch with very long endurance in the field. Its Power Glass solar lens takes it to up to 28 days of smartwatch-mode battery life with unlimited runtime achievable under enough daylight, up to 100 hours of continuous GPS tracking, and up to 36 days in a hiking-style mode that only periodically activates satellite navigation. The 45 x 45 x 14.4mm case combines a fibre-reinforced polymer and aluminium bezel with a monochrome, sunlight-visible transflective MIP display (176 x 176px) and weighs 52g, fitting wrists from 141-213mm. Dedicated tactical tools include a jumpmaster activity mode, waypoint projection, dual-position GPS formatting, a preloaded tactical activity profile, stealth mode, a kill switch and a rucking activity mode, layered on top of Garmin's standard health tracking. It is water rated to 10 ATM and tested to US military MIL-STD-810 standards for shock, temperature and water resistance. This 45mm size suits buyers who want a smaller, lighter tactical watch than the 50mm version; those who want the largest possible case and even longer runtime should choose the Instinct 3 Tactical Solar 50mm instead.