Rear bike indicators
This device allows you to signal your actions to following vehicles or pedestrians.
It's particularly effective even on sunny days.

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This device consists of a small control box for attachment to the handlebars and a transmitter box which, if possible, is attached to the rear basket, otherwise to the seat post. You can use it to signal the following information to vehicles or pedestrians behind you:
Braking
Turning right
Turning left
Steady or flashing light
It comes with mounting systems and a USB port for charging both boxes.
Highly visible system with up to 85 lumens of red light.
Waterproof: IPX4, rainproof