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The Gravity Tail Light has a built in accelerometer that detects deceleration or swerving and automatically changes to a super bright, solid beam to warn following traffic.

• The Gravity Tail Light has a built in accelerometer that detects deceleration or swerving and automatically changes to a super bright, solid beam to warn following traffic.
• Automatic accelerometer brake light function shines 100 lumens bright
• 2 Modes (runtime): Solid – 20 lumens (12 hours), Flash – 80 lumens (30 hours)
• USB rechargeable li-polymer battery
• Includes brackets for seatpost and seatstay mounting