Descirption: Features: 360-Degree adjustment knob, freely adjust the tightness of the for head circumference, enjoy convenience and comfort. Removable elastic sticky strap memory foam back cushion, soft and breathable, comfortable to wear for a long for time without slipping off. Specification: Product Name: Comfortable Decompression Headband with Battery Buckle Model: FV-TD78 Applicable Models: for FPV Flight Glasses V2 Material: Plastic + Memory Foam Net Weight: 137g Packing Size: Approx. 230x186x120 mm/9.05x7.32x4.72 inch Notes: Other demo accessories are not included. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 Piece Headband