3.9 x 3.9 x 0.8 inches

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🍀RECHARGEABLE & PORTABLE.Built-in USB port and a 400mA rechargeable battery,easy to take off and charge,high-grade energy-saving technology effectively lengthen the working hours up to 5 hrs without recharge.Light weight and small size（3.9″X3.9″X0.8″）make it very convenient to carry.
🍀3 LIGHTING MODE.USB Interior led reading light has 3 lighting color modes to change,including amber yellow,ice blue and warm white;Fast press to turn on/off the light;Press 3 seconds to change lighting color.