Havit F9 Ultra comfortable frosted Wireless headphone Innovative technology: Adopts V4.1, fully compatible with Bluetooth-enabled devices, high-speed wireless data transmission,high anti-interference capability,up to 10m working range.Novel appearance, simple design but fashionable, zinc alloy ornament.Ergonomic design: The adjustable sturdy and soft headband and Aluminum Scalable design, can suit difference head shape.Double 40mm dynamic speaker guarantees high fidelity and Stereo CD sound effect; Perfectly meets different needs of music enjoyment.High-precision manufacturing process:  Havit F9 Frosted earmuff housing covered with a thin Smooth reflective metal ring, is firm more Luxurious.