“What charging block wattage do I use ? I seen someone recommended to use a 40 watt charging block is this true ?”
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Thank you for contacting Sony, Tony. The recommendation you heard about a higher wattage block is correct, as it enables the fastest charging possible for your speaker. To ensure optimal and fast charging for your SRS-ULT50, you should use a charging block that is: USB Power Delivery (PD) Compatible Capable of delivering either DC 9 V / 3.0 A or DC 5 V / 3.0 A. A common, reliable choice that meets or exceeds the required 27W output will allow you to take advantage of the speaker's quick-charge feature. We appreciate your interest in Sony products. Should you require any further assistance, please don't hesitate to reach out for support here: https://us.esupport.sony.com/support/s/support-contact?language=en_US&category=ht Best regards, Gus, Sony North America Customer Support
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