The Simson Battery mudguard taillight ''Tunnel'' is a premium quality taillight, specially designed for city, trekking and hybrid bikes. This taillight has 3 red LEDs for a bright light output, even on the sides of the bike. Its modern and innovative design radiates the light at an angle of 220 degrees for optimum visibility. The mounting distance can be modified between 50mm and 80mm with the integrated sliding system. This taillight has an ON / OFF / AUTO switch and low battery indicator. Including batteries: 2 x AAA.

Battery indicator:
On the right-hand side in the backlight there is a battery indicator that lights up yellow when the batteries run out. Replace or recharge the batteries as soon as possible after the battery indicator is activated.

Replacing the batteries:
The taillight housing is closed by the helpt of 'click fingers'. These click fingers are located at the back of the lamp at the bottom.

The easiest way to open the laillight is to first press the left (or right) click finger upwards at the back and then use the (nail of the) index finger to bring the taillight housing slightly forward so that there is a gap . This operation must then be repeated on the other side of the taillight housing. After this, the lamp housing can be tilted upwards and separated from the back.