Homedics Acoustic Relaxation Sound Spa Machine

SoundSpa Features * Six natural sounds * An automatic timer to choose how long you listen – 15, 30, or 60 minutes or continuous play. * LED illuminated OFF/RESUME button to turn off sound or resume listening. * Volume control to adjust sound. * AC adapter to power SoundSpa. Can also use four AA alkaline batteries (not sure if battery compartment works). Selling for a friend. Gently used. Battery compartment has some wear/rust. Works great with plug. No box or instruction manual.