WHAT'S IN THE BOX ULTIMATE EARS WONDERBOOM 4 Bungee (attached to product) USB Cable Quick Start Guide ( printed inside the box) Dimensions Height: 4.09 in (104 mm) Width: 3.75 in (95.3 mm) Weight: 14.81 oz (420 g) (speaker only) Technical Specifications Power Rechargeable lithium-ion battery for up to 14 hours of battery life between type-c USB charges. ? 360° Sound Maximum sound level: 86 dBC (normal) and 87dBC (outdoor) Drivers: two 1.57 in (40 mm) active drivers and two 1.81 x 2.57 in (46.1 x 65.2 mm) passive radiators Wireless Capabilities 131 feet (40 meter) range ? Connect up to two source devices at the same time. Wirelessly play (stream) to 2 WONDERBOOM 4 speakers from one source Compatibility For audio playback : smartphones, tablets and other devices that support Bluetooth [Advanced Audio Distribution Profile (A2DP)] Sustainability Minimum 31% Post-Consumer Recycled Content of the Total Plastic Components. Excludes packaging.