Garmin Astro — DC-50 bundle Handheld unit Display: 2.6″ / 160 × 240 Dimensions / weight with cells: 61 × 160 × 36 mm / 260.1 g Storage: 1.7 GB + microSD Locations / routes / track points: 2000 / 200 / 10,000 Two AA cells, up to 20 hours; IPX7, USB, barometric altimeter and three-axis compass. Basemap and additional mapping. Tracking and mapping Tracks up to 10 dogs with compatible T 5/T 5 mini devices; position updates every 5 seconds. T 5 and T 5 mini sold separately. Range up to 9 miles with T 5 or 4 miles with T 5 mini, depending on terrain and line of sight. BaseCamp trip planning; BaseStation tracking on a computer; wireless data sharing with compatible Garmin devices. 200 saved tracks, custom POIs, paperless geocaching, hunt/fish calendar, sun/moon information, tide tables and area calculation. Turn-by-turn routing with optional detailed road maps. Two AA batteries and microSD card not included.