4.4" x 1.6" Oblong; waterproof LED trailer light acts as reverse / back-up and running lights when properly mounted; suitable for trucks, trailers, tractors, MPVs, RV and buses | Ultra slim, die-casting aluminum housing with durable clear polycarbonate lens over white LEDs, resistant to shock and vibration | DOT compliant safety light; built-in 12 PCS SMD LEDs, features premium optics to output super bright amber light, high brightness for reverse / back up light, low brightness for running light, making them ideal for front or rear vehicle applications, improve visibility at night, in fog or raining day | Low-profile design, comes with gasket and mounting screws for surface mount, can be stacked vertically or horizontally to improve visibility where required | Support 12V DC input only with 3 wire design, red wire for reverse / back up light, black wire for running light, white wire for ground; 24 months manufacture & seller warranty with 60 days money-back or replacement service