The diagnostic lamp in pencil form and stainless steel look, from other malicious software comfort, has a socket clip and push button on and off. Properties of the diagnostic lights Pen shaped,/Penlight Stainless Steel Look/Silver Grey Material: ABS (Acrylonitrile Butadiene Styrene) Plastic and Aluminium Push button on/off Light Bulb: 2.2 V Size (Height x Width x Depth): 16.5 x 7 cm Includes 2 x Long Term 1.5 V AAA batteries