Yamaha SEQTRAK - USB power adapter; USB mobile battery requirements; Charge status (when the power is on)

SEQTRAK User Guide
19
USB power adapter / USB mobile battery requirements
Output voltage
Output current
4.8 V to 5.2 V
1.5 A or greater
CAUTION
Make sure to use a USB Power Delivery (PD) power adapter or USB Power Delivery
(PD) mobile battery with the specifications above. Using the wrong USB device can
result in damage to the product or overheating. Read the safety precautions for your
particular USB devices.
NOTICE
When the product is turned on and the power turns off suddenly and unexpectedly,
your USB device might not meet the requirements or might be damaged. Try using
another USB device that meets the requirements, etc. If the product appears to be
malfunctioning, consult Yamaha service personnel.
3.1.1 Charge status (when the power is on)
Hold down both the [ALL] knob and the [ /PLAY] button. The Global Meter will then light
according to the remaining battery power (charging: cyan blue, not charging: white, trouble:
flashes red).