Meet Specter: a wearable device with LED lights that create unique afterimages at night to keep you visible. You can use its companion app to customize its text or image. Users can adjust colors and the brightness of the LEDs easily. Specter has a waterproof design with 48+ hours of battery life. It connects to smartphones via Bluetooth.
The device is compatible with iOS and Android devices. It can serve as a regular fitness tracker too.