As seen on the GCN channel

YouTube Video here 

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BE SEEN with style DAY & NIGHT

Designed for the modern cyclist. Equipped with ultra-bright LEDs, engineered optics, motion detection. THE BEAM LUCIA is the next-generation bike rear light that you've ever dreamed of.

The taillight mounted on a saddle rail has five lighting functions. It is equipped with an advanced triaxial accelerate sensor technology to accurately trigger a stoplight when breaking.  In addition, LUCIA uses an illuminance sensor to automatically turn on when a cyclist rides on dark roads. 

LUCIA turns itself off if no movement is detected & turns instantly on when you start pedaling.

Whether you're a Pro, Weekend Warrior, or Cycling Commuter, we know you want and deserve the best and safest tail-light, BEAM LUCIA is different from other Tail-lights ever introduced in the market.

The unlikely design blends with any modern bike layout and is a must-have for all bicycle riders who go out biking in the dark.

It can be mounted on all type of bicycle saddle with rails using a dedicated mount. It has a built-in rechargeable lithium-polymer battery.

• Water-resistant: IPX4
• Night detection mode 
• Accurately triggers a stoplight when breaking
• Smart On/Off movement detection
• Runtime: 22hrs on (in Night detection & Braking Mode)
• Weight: 39g

How to use it here.