Large size black slippers with a high-quality heater and an 8000mAh battery, providing comfortable warmth. 【Perfect for "Cool Head, Warm Feet" - Electric Slippers with Built-in Japanese Heaters on Both Sides】This year, we listened to our customers and improved the heater section. These electric slippers use Japanese-made heaters, which are more durable and less prone to internal wire breaks, preventing them from overheating. The structure with two heaters, one on the top and one on the bottom, not only warms the soles of your feet but also the toes, which are most susceptible to cold. After wearing them, the heaters quickly generate heat, warming your entire feet, making them ideal for "cool head, warm feet." 【Wireless and Movable & 3-Level Temperature Adjustment】Unlike USB foot warmers on the market, these electric slippers have no wires. You can attach the battery and freely walk around the house, perfect for housework or working from home. The electric slippers can be adjusted in 3 levels, from 45 to 65°C, satisfying most temperature needs. You can freely choose from a wide range of temperatures, from low to high, depending on your preference and the surrounding environment. High temperature mode 65°C (red light), medium temperature mode 55°C (blue light), low temperature mode 45°C (green light). Warm your body from your feet up! The electric slippers have one power button, making them easy for anyone to use! 【Includes 2 x 8000mAh Batteries & PSE Certified】The foot warmer comes with two lightweight batteries. Although small, they have a large capacity of 8000mAh and can be used for approximately 4 hours on high mode, 6 hours on medium mode, and 9 hours on low mode. Furthermore, the batteries are not only PSE certified but also have a built-in NTC chip, providing protection against overheating, overvoltage, overcurrent, and overload, further enhancing safety! 【Comfortable to Wear & Non-Slip & Unisex】The electric slippers use high-quality polyester fiber material, which is gentle on the skin. You won't feel any discomfort even if you wear the electric slippers directly without socks. They also have excellent heat retention and windproof effects. The design that completely wraps your feet provides excellent heat retention, and you'll feel warm immediately when you turn on the heater. Adults, children, and the elderly can all enjoy them. They are also a good choice as a gift. The soles are non-slip, making them safe to walk in. Thank you for viewing.