Note: The battery is not removable, battery life: about 180 days, battery 40mAH Material: ABS + Light Emitting Diode + Battery, Size: 4.1 * 4.1 * 0.7cm Thickness 0.5 * 0.75/1mm (the thickness of the 3 corners is different) This auto illuminated guitar plectrum emits a stunning white, green or purple glow, adding a touch of magic to your performance. The illuminated guitar plectrum ensures excellent visibility on stage, allowing you to effortlessly capture your audience's attention and create a mesmerising visual experience. This light-up guitar plectrum is a great gift for guitar and bass lovers. Its unique design and vibrant lights are sure to impress any musician or music lover. Whether you are playing in a concert, gig or improvisation, this light up guitar plectrum is suitable for all types of music. It adds a cool and glamorous element to your playing style. This guitar plectrum can automatically recognise when you are using the light on and will automatically turn off the light when you are not using it.