The markings: T4W Base symbol: Ba9s Number of diodes: 1xLED Diode type: 1xSMD5050 Power: 0.24W Voltage: 12V DC Color: Blue LEDs, 2 pieces packed in a blister. Replacement: Ba9s / T4W Usage: Parking lights, side markers, door and locker lighting, car interior lighting, license plate, signal lights. Advantages of LED bulbs: longer lifespan compared to standard incandescent bulbs lower power consumption faster on/off time shock resistance easy installation more vibrant colors Our diodes have an electrical system with a tolerance of up to 16V, so they do not burn out during possible voltage surges. Manufactured on a Taiwanese chip, not on a cheap Chinese equivalent used by the competition. By using Taiwanese components, we achieve a longer lifespan and more light (lumens) than Chinese competitor products.