Ryobi ZRP746 ONE+ 18-Volt Dual Power Stereo with Bluetooth Wireless Technology (Tool Only - Battery, Charger, and Extension Cord Sold Separately) (Certified Refurbished) LITHIUM-ION BATTERY, CHARGER, AND EXTENSION CORD NOT INCLUDED Bluetooth wireless connectivity allows users to stream music directly from their phone to the stereo 2.1 USB charger charges phones and tablets Dual Power - Can be powered by a lithium-ion battery (sold separately) or an extension cord (sold separately) Built-in audio equalizer allows the user to adjust bass and treble levels to their liking