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.