1This collimator has built-in battery and supports 7 levels of brightness adjustment of laser 2Can help accurate collimation of telescope in a quick and easy way 3With an adapter, transferring 1.25inch to 2inch thread 4Power saving design, low consumption and durable for long time use 5Suitable for Newtonian, Marca Features:This collimator has built-in battery and supports 7 levels of brightness adjustment of laser. Can help accurate collimation of telescope in a quick and easy way. With an adapter, transferring 1.25inch to 2inch thread. Power saving design, low consumption and durable for long time use. Suitable for Newtonian, Marca. Specification:Material: MetalColor: BlackLaser Power: 1mw Laser Brightness Adjustment: 7 levelsBattery: 1 x CR2032 (included)Adapter Type: 1.25inch - 2inchCollimator Size: Approx. 13x 3.17cm / 5.11 x 1.2inchWeight: Approx. 253gSuitable for Newtonian, MarcaPackage List:1 x Collimator1 x Lens Adapter1 x Manual