Buyers should prioritize food-grade materials such as BPA-free Acrylic, PS, or PE (Polyethylene) to ensure safety and durability. For the lighting component, look for high-efficiency SMD LEDs with a lifespan of 50,000+ hours. If the product is for outdoor or poolside use, an IP65 or IP67 waterproof rating is essential to protect the internal electronics from melting ice and spills. Additionally, verify the battery capacity (typically 1000mAh to 4000mAh) to ensure a continuous working time of 8–12 hours on a single charge.