Garmin Varia RTL515 Cycling Rearview Radar with Tail Light

Amazon - Garmin

A rearview radar and tail light that warns cyclists of approaching vehicles up to 153 yards away.

• Type: Cycling Rearview Radar & Tail Light
• Connectivity: ANT+, Bluetooth
• Light Modes: Solid, Peloton, Night Flash, Day Flash
• Visibility Range: Up to 1 mile
• Battery Life: Up to 16 hours (day flash)