Altec Lansing inMotion iM9 Portable Mobile iPod Speaker Dock with Backpack - Bonus Pack of 2 This bundle includes 2 Altec Lansing inMotion iM9 portable mobile iPod speaker docks with backpacks Huge, crystal-clear sound with large speakers; AC or battery-operated (takes 4 "C" batteries - not included) Charges your iPod; MaxxBass technology provides superior bass without a subwoofer; Retractable dock connection Class D amplifier for maximum sound and energy efficiency; Shock-resistant design for rugged durability; Video output for iPod photo and iPod video Features a 3.5mm headphone jack; Includes an input jack for second device connection, including CD and DVD players; Deluxe Backpack included for storage