The Hobnail WallScents Warmer features a vintage-inspired textured translucent surface in soft blue, casting a cozy glow while gently warming oil for long-lasting fragrance—compact, flame-free, and perfect for small spaces. FUNCTION: WallScents Pluggable Fragrance Warmers can be used in both vertical and horizontal outlets by twisting the plug base, making them ideal for above-counter outlets and smaller spaces. Use with our wide variety of Fragrance Oil Refills.