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Dear customer, thank you for your interest in Jackery products. Absolutely, you can use your Marshall Bluetooth speaker with our Jackery power stations to ensure continuous music playback even if the speaker's battery runs out. For example, The Marshall Stanmore II Bluetooth Speaker can deliver outputs up to 80W of total power. The Explorer 290, with a battery capacity of 290Wh and an output power of 200W, could theoretically power the marshall Bluetooth speaker for approximately 3 hours (multiply the battery capacity by 0.85 and then divide by the device's power consumption, calculated as 290×0.85÷80). Please consider this an approximate figure, as actual runtime is influenced by the exact power requirements and series of your marshall Bluetooth speaker, additional connected devices, and more. It's crucial to ensure that the total power draw from all devices connected does not surpass the Explorer 290's 200W output limit to prevent system overload. For a precise calculation or further assistance, our customer service team is at your disposal (Customer Service: [email protected] / +1-888-502-2236 Weekdays 9AM to 5PM PST). Warm regards, Jackery Support Team
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