Physical & Performance:
Unit dimensions, WxHxD:	2.3" x 6.3" x 1.3" (5.7 x 15.9 x 3.2 cm) (Astro 220)
Display size, WxH:	1.5" x 2.2" (3.8 x 5.6 cm)
Display resolution, WxH:	160 x 240 pixels
Display type:	256-color TFT
Weight:	6.5 oz (185 g) without batteries
Battery:	2 AA batteries (not included)
Battery life:	24 hours
Waterproof:	yes (IPX7)
High-sensitivity receiver:	yes
PC interface:	USB

Maps & Memory:
Basemap:	yes
Ability to add maps:	yes
Built-in memory:	none
Accepts data cards:	microSD card (not included)
Waypoints/favorites/locations:	1,000
Routes:	50
Track log:	10,000 points; 20 saved tracks

Features:
Frequency band:	MURS
Range:	5 miles (line of sight)
Additional:	Tracks up to 10 dogs simultaneously