The PR-D7 is a true ultra-compact portable AM/FM Digital radio being ultra- compact in size (a mere 8" long and stands 4 Â½" tall and weighs 1.3 lbs). All controls are conveniently located and you can see the frequency and time on the display. Tone is well balanced and excellent for both talk and music. The PR-D7 has excellent sensitivity and selectivity and will surprise you at its ability to pull in those distant stations. Five presets are available on each band and the auto seek will automatically seek the active stations across the entire band rather than to the next frequency. The radio can be set to automatically turn off after 120, 90, 60, 45, 30, or 15 minutes, so you can fall asleep to the sound of music, talk, or news. Sleep alarm allows you to wake up to music or beeper with Humane Wake-up System. You can power it with the included AC Adapter, or six "AA" size batteries (not included). In addition the PRD-7 can be powered with six rechargeable AA batteries which you can charge right in the radio. Headphone jack turns off speaker when headphones are used.