Fully Loaded Bullet Headphones Listen to voice calls with clarity, thanks to interference-reduction technology in the in-built microphone. Fully compatible with most smart devices. Volume up/down functions All-metal sound chamber with enhanced Bass Response, movable piston design, is produced with high-precision lathe machines. Interfering with sound restoration in the headphones. The new dual damping system in Headphones disperses the reflected sound waves and reduces their effects on the diaphragm, giving you a purer audio experience Kevlar fibers within the cable can reduce tangles, resist breaks, and enhance durability.