Stainless Steel Outer And Inner | Double Wall Construction For Insulation Of Hot Or Cold Liquids | Snap-On, Spill-Resistant Thumb-Slide Lid | Non-Slip Bottom | Meets FDA Requirements | BPA Free | Hand Wash Recommended (Remove Speaker Base Prior To Washing) | Features High Definition Bluetooth® 5.0 Wireless Technology | Simply Pair Your Handheld Device To Enjoy Dynamic Stereo Sound | Multi-Color Light Pulses To The Beat Of The Music | 450 mAh Lithium Polymer Battery Included | Pairs From Up To 32 Feet Away | Up To 5 Hours Of Play Time | Low Power Warning | Features A USB Output And Micro USB Input (Cord Included) | Works With Most Smart Phones And Audio Devices | The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of such marks by Hit Promotional Products®, Inc. is under license. Other trademarks and trade names are those of their respective owners.