Only Fit 3.5x3.5/4x4/5x5 Inches Posts: These solar post lights suitable for 3.5"x3.5", 4"x4", 5"x5" wooden or vinyl posts. Each one includes 2 removable adapter bases for an ideal fit. Install in 1 minute flat with screws provided. (Note: For a perfect fit, please measure your post before purchase.) 2 Light Modes-Warm/Cool White: Switch effortlessly between warm glow and cool white light. With a modern design, these outdoor post lights are perfect for your wooden or vinyl fence, deck, patio, garden, porch, or mailbox. (Tip: Before installation, slide the switch to select the color you need.) 10-12 Hours of Steady Glow: 30% more-efficient solar panels work wonders. With just 6-8 hours of sunlight for a full charge, this deck post lights solar powered automatically delivers a steady 10-12 hours glow from dusk till dawn. Upgraded One-Piece Design: Unlike old-fashioned part-assembled models, our fence post solar lights are fully integrated from top to base, eliminating gaps, preventing water seepage, and boosting wind & water resistance. FCC-certified. Reliable IP65 Waterproof: When bad weather hits, our IP65 outdoor solar deck post lights stand strong, lighting up your fence even in wind and rain, while other IP44 lights may falter.