Check the listing for details. Brass 1.5cm*0.6cm 3V Mini Laser Dot Diode Module Head WL Red, with 4cm Wire. Condition: New. Listed at 2.09 USD. Brass 1.5cm*0.6cm 3V Mini Laser Dot Diode Module Head WL Red, with 4cm Wire Product Description】: 【Type】: Mini Laser Dot Diode Module Head 【Shell material】: brass 【Overall dimension】: 1.5cm in length * 0.6cm in diameter 【Conductor length】: 4cm 【Input voltage】: 3v (2 No. 5 1.5V dry batteries) 【Wiring mode】: red wire is connected to the positive pole, and blue wire is connected to the negative pole 【Spectral color】: red 【Reference range】: about 40M-80M 【Weight】: 1.27g 【Features】: Miniature laser head, low power, very safe, used for DIY production and various popular science production. The voltage is 3V, the red line is connected to the positive pole, the blue line is connected to the negative pole, and the red light spot can be emitted. The distance can reach more than 40 meters, which can be used for positioning, etc., and also can be used for making light alarms. For example, if the laser is directed to a photosensitive resistor, as long as the middle is blocked by anything opaque, the light will be cut off, and the photosensitive resistor will be disconnected or connected. 【Use】: It can also make teaching whip and laser pen. 【Note】】: 1.The product dimensions are all measured by hand, and there are tolerances in the dimensions. 2. Due to different photographic products, the actual color may have color difference, which is subject to the actual object. Packing Quantity】: According to your choice. On Mar 21, 2023 at 11:13:05 PDT, seller added the following information: