Just add saltwater for instant power. It delivers stable output power essential for portable devices, while its ultra-lightweight and handheld size enables on-the-go power supply. Featuring an exceptionally wide operating temperature range and a fully waterproof design, it remains reliable in harsh conditions. A single 300g set of power generation sheets contains a substantial 500Wh of power, capable of generating electricity instantly even after years of storage. The product operates silently, is intrinsically safe, and is user-friendly, making it easy for even the elderly and children to use. We hope this product becomes your reliable energy safeguard for protecting family security.