Standard W5W 12 V wedge bulb, supplied in pairs so both sides get replaced together.
The BOSCH W5W car bulb is a 5 W, 12 V wedge-base lamp for parking lights, licence-plate lighting, dashboard illumination and interior lights. Each pack holds 2 bulbs with the common W2.1x9.5d glass base fitted to most passenger cars.
W2.1x9.5d base for a direct swap
The bulb pushes straight into its holder — no bayonet pin, no screw thread — so a roadside replacement is usually possible without removing the headlamp. W5W is an international designation, so compatibility comes down to the base type listed in your owner's manual.
5 W at 12 V for markers and interior light
The low power draw keeps the wiring load minimal and matches what carmakers specify for position lights. Typical uses are front and rear markers, licence-plate lighting, dashboard and boot lamps.
Two bulbs per pack — one stays as a spare
Marker lights work in pairs and are best changed together for an even output on both sides. The second bulb doubles as the spare that belongs in every roadside kit.