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Working voltage: 4.5V Suitable for DIY of laser module equipment, easy to use. Easy installation: stainless steel spring fixed. It is very convenient to install and replace the battery, and it is not easy to damage other parts. Tough material: Made of tough material, good toughness, not easy to crack. The product does not contain batteries, you need to buy 3 AA batteries yourself, Weight: 180.0 grams, Manufacturer: BEITESI