The Panasonic Shockwave radio/cassette player is a small, durable portable with a digitally tuned FM/AM radio and cassette player. Made with the special Shockwave Metal design, the player has a durable aluminum body with floating construction, side rubber protector, and twist lock system. Its an ideal player for active outdoor lifestyles. The RQ-SW99V uses the Brain Shaker Extreme Headphones featuring VMSS (Virtual Motion Sound System). The VMSS unit transforms bass signals into vibrations, enabling you to actually feel music signals that are not typically reproduced by headphones. The horizontal, back-of-the-neck headphones contain a three-key remote control--great for controlling the player while youre jogging or doing another active sport.