• 20 oz. (600 mL) double-wall vacuum insulated bottle paired with TWS wireless earbudsin lid storage compartment. • Power/Technology: Earbud Battery – Rechargeable Lithium battery in each bud. Capacity: 40 mAh; Working Voltage: 3.7V - 4.2V; Mic Sensitivity: -42 ±3dB; Wireless Frequency: 2.4-2.48gHz; Wireless Range: 10M (30 feet); Audio Transmission Wireless Profile: A2DP/HFP/HSP/AVRCP; Charging Base - Rechargeable Lithium battery: 240 mAh; Input: DC 5V; DC Charging Current (MAX): 0.24A • Bottle is double-wall vacuum insulated 201 Stainless Steel exterior, 304 Stainless Steel interior • USB charging cable and Instructions included. • FCC Approved. • Vacuum insulation helps keep your hot beverages warm longer and cold beverages cool longer than bottles and tumblers without vacuum insulation. • Hand-wash only.