The integrated sensor detects any braking. Then a line of light starts to illuminate very brightly and clearly, to indicate to following traffic, that you are slowing down. NEW: In case of abrupt full braking, the brake light switches one step higher into the pulsating emergency brake light function. In this mode, BREX indicates the dangerous situation with hitherto unprecedented signaling and thus helps prevent accidents. Practical: BREX functions automatically. Unlike brake lights used to date, no separate cable connection to the brake lever is required. Applies to all our rear lights: Approved in accordance with StVZO (German Road Traffic Ordinance WVW). There is an additional approval for France for this taillight. Specifications: Color: red Material: plastic Model: Toplight Line Brex Mounting: luggage carrier Mounting distance: 50 mm Power supply type: e-bike Quality mark: Varefakta (DK), StVZO