Perfect for improving sleep, blocking noise,. managing tinnitus, for dorm use, baby’s room, etc. 10 unique white noise sounds provide perfect tone. selection. Patent pending White Noise Generator results in. seamless, non-looped sounds. Play music from your iPhone/iPod/MP3 by plugging. into the "Input Jack". 4 position timer with continuous play or auto shut off. in 30, 60, or 90 minutes. Replay button plays last played sound, timer and. volume selection. Headphone/pillow speaker jack. USB powered - power from your PC or wall outlet. with included cord. AC powered (battery back up). Big 3" speaker for high quality sound yet compact. size (4.6 x 4.3 x 2.3"/11.7 x 10.7 x 5.6 cm) is ideal for. home or travel. Super energy efficient - keep it running day and night. as it consumes less than 1% of the electricity of. traditional white noise machines. Dimensions: 4.75" x 2" x 4.5"