Features:Dual piezo pickup， 6.35mm / 0.25in jack.With volume and tone control.Ideal for guitar， ukelele and so on.Specifications:Jack diameter: 6.35mm / 0.25inPackage size: 21 * 8.7 * 1.5cm / 8.3 * 3.4 * 0.6inPackage weight: 43g / 1.5ozPackage List:1 * Pickup