Yamaha THR30II THR30II Wireless THR10II Wireless THR10II Reference Manual - Page 17

Specifications THR30II Wireless, THR10II Wireless* Power Button LED status list * Since the THR-10II does not have a built-in rechargeable battery, the power button LED status is only red (ON) and off (OFF).  When not using the power adaptor Red The power is ON Unlit The power is OFF  When using the power adaptor Green Charging Red The battery is full and the power is ON Unlit The battery is full and the power is OFF Charging error indication Flashes (green  red) When the power is on Indicates charging error Flashes (green  unlit) When the power is off Indicates charging error If the built-in rechargeable battery has a charging error, immediately turn off the THR-II Wireless power, unplug the power adapter, and consult your Yamaha dealer. THR30II Wireless THR10II Wireless THR10II Reference Manual 17