Blacklight Invisible Ink Marker 9LED UV Ultra Violet Flashlight Torch Light 9 LED 1 Mode UV blacklight flashlight LED Qty : 9 ultra bright LEDs Voltage: About 3.6V - 4.2V Power: 3x AAA battery (not included) Size: 8.8cm x 2.5cm x 2.5cm - 3.45inch x 0.98inch x 0.98inch