SENTRY 'MICRO' RECHARGEABLE L.E.D. The Narva Sentry 'Micro' Strobe is compact (54mm tall), lightweight and can easily fit inside the glove box or centre console of most vehicles. Featuring adjustable SAE class 1 light output, the Narva Sentry 'Micro' is the perfect warning light for personal vehicles, fleet, light commercial, commercial and construction applications.