Specifications:Case material: ABS electrochromismLED emitting color: Multicolor change automaticallyExternal thread diameter: 2.4cmItem size: 3.5 * 2.8cm / 1.4 * 1.1in(length * diameter)Item weight: 20g / 0.7ozPackage size: 11 * 7 * 3cm / 4.3 * 2.8 * 1.2inPackage weight: 30g / 1.1oz Have a good day !