1. [Multifunctional Hairbrush] The scalp brush is designed for brushing hair with hair serum or oil, allowing the liquid to penetrate deeply into the hair roots and massage the scalp, stimulating scalp cells and preventing hair loss. It reduces liquid waste and avoids mess, eliminating the need for traditional sprays, making it an ideal gift for friends or family. 2. [30ml Large Liquid Reservoir with Viewing Window] The scalp brush has a built-in 30ml liquid reservoir that accommodates a hair serum, essential oil, or conditioner extension. It's large enough for a single treatment. The viewing window lets you see how much liquid is remaining, preventing wasted liquid. 3. [Easy to Grip and Portable] The scalp brush features an ergonomic "S"-shaped design that's non-slip and easy to grip. It drains smoothly, requires no batteries, and is slim and lightweight, making it easy to carry anywhere. 4. [Waterproof and Easy to Clean] Easy to clean and refill. Made of ABS, silicone, and stainless steel, it's durable and waterproof, making it easy to clean all over. 5. [Leakproof] The edges fit snugly, preventing spills or leaks. Note: This is not suitable for liquid storage. Please use all the liquid each time, otherwise it may cause liquid deterioration or other problems.