Notice: This product requires connection to an AC outlet as it has no battery option. The 12V AC plug ensures a consistent and effective heat level, which cannot be achieved with a 5V USB connection. Please this meets your needs before purchasing. If you prefer a wireless option, this may not be the right product . Design Choice: We specifically designed this product with a plug-in AC power source to it meets the necessary voltage requirements for optimal heat output. Wireless and USB-powered options simply don't provide the consistent power needed to achieve the level of heat this product delivers, which is why we've chosen the AC plug-in design for better performance. Three Heating Level: Featuring adjustable temperature settings, allowing users to customize the level of heat based on their comfort and therapeutic needs. Targeted Relief: Designed specifically for the elbow, wrist, ankle and other small areas, providing focused and effective uncomfortable relief to the area. Comfortable and Secure Fit: Ergonomically designed to fit the elbow or other samll areas comfortably, ensuring a secure and snug fit during use. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC100-240V Color: Black Material: Diving Fabric Package Contents: 1 x Heating Pad Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.