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.