5V laser head、 dot laser diode、 copper semiconductor laser diode; Outer diameter: 6mm; Wavelength: 650nm; Power: 5mA; Please pay attention to the battery safety、 prevent battery from short circuit burning or explosion by dismounting the battery; Good monochromaticity、 good coherence and good directivity、 high brightness; Mainly use for laser toy、 various gradienter、 rotating laser level; And it can make electronic pointer pen; HF-LD; Micro liquid crystal display; Long distance sound monitor; Long distance light control anti-theft alarm; Long distance laser wireless communication; This laser head is composed of Luminous tube core、 condensing lens、 adjustable copper cover; They are assembled and the lens is adjusted; Can be used directly via connecting to 5V power supply Dimensions: 0.59 in x 0.24 in x 0.24 in (1.5 cm x 0.6 cm x 0.6 cm) Weight: 0.49 oz (14 g)