Philips AX3211 Jogproof Portable CD Player Extended battery playing time: Enjoy up to 72 hours of powerful music; ESP  Energy Saving Programmability: Energy saving system that powers unit off after a specific period of use; Automatic Power Off 45-second electronic skip protection: Detects shocks automatically and buffers music for continuous play CD, CD-R + CD-RW Compatible: Automatically detects and plays homemade CDs Digital Dynamic Bass Boost (DDBB): Enhances bass at low, mid and high volumes to give deep, rich sounds Multi-line LCD display: Displays album information such as track number and elapsed time indications on a convenient multi-line display