If voltage is 6V,then choose 6V.Our Product Advantage: its quality is perfect. Work with a Constant Current LED Driver. All our LED chips (Hontiey) are 100% enough Power. They will work more than 50000 hours if the working temperature is less than 60 Degree Celsius. So, they need to work wih heatsinks or Thermal Silica otherwise the light will die due to too much heat. colour: Transparent colorMaterial: metalQuantity - Voltage : 20 pcs - 6V - no power cablePackage Contents: 20* LED Lamp Bead with Concave lensReminder: Please do not look directly at the Light within two meters so that can ensure your security for your eyes.Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.