Ultimate Ears Boom 4 Portable Speaker - Active Black Condition:Great and instantly see the impact

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Sweat and water-resistant

Ultimate Ears Boom 4 Portable Speaker - Active Black Condition:Great and instantly see the impactTechnical Specifications General Specifications Battery life: Up to 15 hours of battery life between type C USB charges*. (*Actual battery life will vary with use, settings and environmental conditions.) Battery type: Rechargeable lithium ion battery Maximum sound level: 85 dBC (normal)*. (*The actual SPL may vary depending on the environment.) 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