Package includes: replacement mini light bulbs for Christmas tree lights Size details: base length is 0.43 inch, inserted part width is 0.3 inch; bulb length is 1.26 inch, diameter is 0.2 inch. Please verify compatibility with your existing lights before purchasing. Specifications: 2.5 volts, 0.425 watt, 0.17 ampere. These incandescent bulbs are made from quality materials and tested by the manufacturer. Designed for use with 50-, 100-, or 150-light sets. How to replace: Unplug the light set first. Remove the broken bulb and discard it. Ensure the two wires of the new bulb are positioned on opposite sides of the base—do not let them cross or touch. Insert the new bulb at a right angle and push it in fully. Plug the set back in to test. Applicable occasions: Suitable for artificial Christmas trees, wreaths, and garlands. Ideal for replacing burned-out or aged bulbs. Note: If the plastic housing does not match your original lights, reuse the glass bulb and wires with your existing plastic housing.