Amber & Red Clip-On Book LightHOW TO USE: A short press of the power button will change the color Amber Red Combo. Pressing and holding the power button will change the brightness. Battery indicator shows battery life so you know when you need to recharge. CIRCADIAN RHYTHM, LIGHT & SLEEP: Our Night Reader book light emits your choice of amber or red light. Amber light at 1600K is 99. 94% free of blue spectrum light, while the 625nm red light is 100% free of blue light. At night,
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