Sony DEJ915 Portable Discman Player Ultra-light at 0.38 pounds and ultra-slim at only 3/4-inches high Provides up to 57 hours continuous play with internal/external battery system Super fast Sony G-Protection antiskip buffer Includes optical digital-audio output and CD to MD text data transfer 64-track programmable CD memory, Sony MegaBass system, and automatic volume limiter with two presets