This item consists of the demo box (free) and five Brex rear lights. Busch + Müller presents Brex. Real brake light with emergency brake signal for E-Bikes. With sensor technology: No connection to a brake lever required. The display is connected to the socket per plug and then automatically alternates between normal light, brake light (brighter light) and emergency brake light (inconspicuous pulsating light). Note: The rear light in the presentation box is a special demo variant that cannot be connected to an E-bike.