The Garmin Varia RearVue 820 features is their most powerful and precise radar yet with a wider field of view, giving you more reliable alerts than ever before. The tail light offers up to 2 km (1.24 miles) of visibility and has a brake light that shows when you’re slowing or stopping.

• Reliable rear radar detects vehicles up to 175 m away
  
• Lateral vehicle positioning for enhanced situational awareness
  
• Vehicle size classification and threat detection based on speed, size, and lateral range
  
• Integrated rear tail light with brake light functionality
  
• Visibility Distance: Up to 1.24 mi (2 km)
  
• Radar Beam Width: 60°
  
• Viewing Angle: 220°
  
• Light Modes: Solid, Peloton, Night Flash, Day Flash
  
• Custom Light Mode Configuration: Yes (with Varia Mobile App)
  
• Lumens: 25 Solid, 8 Peloton, 40 Night Flash, 100 Day Flash
  
• Radar-Only Mode: Yes
  
• Battery Life: 10 hours Solid, 15 hours Peloton, 10 hours Night Flash, 24 hours Day
• Flash, 30 hours Radar-Only
  
• ANT+: Radar and bike light connectivity
  
• BLE: Radar and bike light connectivity
  
• Water Rating: IPX7
  
• Varia App Compatible
• Dimensions: 3.9" x 1.0" x 1.7" inch (98.9 x 25.9 x 43.2 mm)
  
• Weight: 3.2 oz (90 g)