This pre-wired LED is Super small with resin cover to protect, with 10cm wired,Super strong LEDs and wire, The wire is bendable, it easy to fix any shape as you like You can connect with any 3V battery directly All LEDs work in 3-3.3 Vdc Do not need add any resistor, it can work with normal 3V battery (Example: CR 2032 battery, CR 2025,.3A X 2, 2A X 2 or any 3V battery , ) If you want the LEDs work in other voltage,we provide below resistors in the package too 20 resistors (not pre-soldered) for 3.5-5V are included. 20 resistors (not pre-soldered) for 5-9V are included. 20 resistors (not pre-soldered) for 9-14V are included. Specifications : The LEDs size is : (length)06 X 0.3(width) X 0.3(height) -Luminance intensity: 300 mcd / 120degree Viewing Angle -Emitting color: White -Forward voltage:3-3.3VDC Compatible. (if you need the LEDs work in other voltage, please add resistor) -Forward current Typical: 15mA or below; Max: 20mA -Viewing angle:120degree Viewing Angle Applications and Installations: Suitable used in any small model, cosplay, small model building, Very low power consumption, and high luminous intensity Recommended voltage is 12V Package included : 20pcs pre-wired SMD LEDs (pre-soldered) with 10cm wire length 20pcs resistors (not pre-soldered) for 3.5-5V are included. 20pcs resistors (not pre-soldered) for 5-9V are included. 20pcs resistors (not pre-soldered) for 9-14V are included. Search LUNENG LED for more related leds