201 Stainless Steel exterior, 304 Stainless Steel interior; 20oz (600 mL) double-wall vacuum insulated bottle paired with TWS wireless earbuds in lid storage compartment; Power/Technology: Earbud battery – Rechargeable Lithium battery in each bud Capacity: 40 mAh; Working Voltage: 37V – 42V; Mic Sensitivity: -42 ±3dB; Wireless Frequency: 24-248gHz; Wireless Range: 10M (30 feet); Charging base – Rechargeable Lithium battery: 240 mAh; Input: DC 5V; DC Charging Current (MAX): 024A; USB charging cable and Instructions included; Hand-wash only; Product Size: 9.84″ h x 2.75″ dia.; CA Prop 65 Warning Label required for all shipments into California; Shipping available to contiguous U.S. addresses and Canada via Ground only. Cannot ship via Air, Internationally or to Alaska, Hawaii, Puerto Rico and any other small U.S. island territory.