I bought this but haven't had a chance to use it, so I'm selling it! I'm open to price negotiations! This is a quiet, portable neck cooler that uses the latest Peltier element technology to cool the perceived temperature by -16°C. - Model Name: Portable Neck Cooler - Cooling Technology: Equipped with the latest Peltier element - Noise Level: Quiet - Size Adjustment: Adjustable size - Cooling Temperature: Perceived -16°C - Accessories: USB cable, instruction manual - Charging Method: USB Power Delivery 【Peltier Element Cooling Technology - Experience Extreme Cold of Up to -16°C!】 Utilizing cutting-edge Peltier element cooling technology, the cooling efficiency has been significantly improved! Three cooling plates firmly wrap around your neck, providing rapid cool-down. The instantaneous extreme cooling temperature can reach a maximum of -17°C, providing a refreshing coolness even in the scorching summer heat. With this one device, you can enjoy a comfortable summer without being defeated by the heat. It's also a perfect summer gift for your loved ones! 【Two Modes - Adjustable Neck Size - Foldable for Portability!】 Equipped with two cooling modes to choose from depending on the situation! The "Strong Mode" can cool up to -16°C below the ambient temperature and operates continuously for approximately 9-12 hours (when using a 30000mAh battery). The "Weak Mode" cools up to -12°C and can be used for a long time, approximately 13-16 hours. The neck size can be adjusted from a minimum of approximately 350mm to a maximum of approximately 450mm, fitting perfectly for women to large men. The lightweight and foldable compact design allows you to store it in a bag or pouch, making it easy to carry! 【Ultra-Quiet Design - Great for All Heat対策 Scenes!】 Because it uses cooling plates, there's no worry about hair getting tangled or foreign objects getting caught. You can use it safely and securely. Furthermore, it has a quiet design, so you can use it without hesitation in quiet places such as offices and libraries. It's a must-have item that is great for work in the scorching sun, commuting to school, outdoor activities, camping, exercise, walking, mountain climbing, BBQ, fishing, and more! Let's enjoy a comfortable everyday life this summer with this neck cooler! Thank you for viewing.