The set includes 5 red 3 mm LEDs with connection cables and a built-in resistor for 5 V. These LEDs are suitable for model making, speedometer lighting, TV backlight and a variety of hobby projects. Each LED is 3 mm in diameter with about 20 cm of cable. This size and length provide flexible mounting for many applications and simple integration with standard 5 V supplies. Brightness is 2000–2500 mcd. They are dimmable and operate between 4–6 V, with 5 V recommended for most uses and a typical current of 20 mA. Specifications: beam angle is 30°. The negative pole has a notch to indicate polarity; reverse polarity keeps the LED off and will not damage it. The LEDs can be soldered or clamped to the cable for secure mounting. 2-3 practical use scenarios: - Inside model kits or RC vehicles to illuminate cockpits, dashboards or cabin details. - Instrument panels or speedometer areas in hobby projects, car models or scale dioramas. - TV or monitor edge/backlight accents, signage, or other low-profile backlighting tasks. Designed for straightforward installation with built-in resistor for 5 V operation, these LEDs offer reliable light with a compact form factor and clear polarity indication.