Lightkiwi R8481 Tenor Foldable LED Music Stand Lamp, USB Light, Reading Light - Rechargeable & Free AC Adapter Included! The Tenor Foldable Music Lamp can be charged via USB or power adapter. The Tenor Foldable Music Lamp has three different places where it bends. Next to the power button there is a light that indicates the charge of the battery Adjusting the light with a single button simple; press the power button to turn on the light, press the power button a second time to dim the light a bit, press it a third time to dim the light to the lowest setting possible, and press the power button a fourth time to turn it off.