Set of 2 RED and 2 YELLOW LEDS and 4 Wires with Plugs for the newest Heng Long TK6.0 and TK-6.1, 7.0 and 7.1 boards and should be long enough to reach the Front and Red LEDS in most 1/16 Heng Long tanks and WPL and JJRC Vehicles. The LEDS are already wired with a resistor for use with 5V-7.4V. You will need the tools and knowledge to solder and troubleshoot for correct installation of these. Please reach out prior to purchasing with any questions. Youâll need to ensure that this is the exact item that you need. There are No Returns or Exchanges on any of our products.