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: 1,000
• Routes: 50
• Track log: 10,000 points; 20 saved tracks

Features:

• Automatic routing (turn by turn routing on roads): yes
• Electronic compass: yes
• Barometric altimeter: yes
• Hunt/fish calendar: yes
• Sun and moon information: yes
• Area calculation: yes

Other:

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