Feature 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, MarcaSpecification 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: Metal Color: Black Laser Power: 1mw Laser Brightness Adjustment: 7 levels Battery: 1 x CR2032 (included) Adapter Type: 1.25inch - 2inch Collimator Size: Approx. 13x 3.17cm / 5.11 x 1.2inch Weight: Approx. 253g Suitable for Newtonian, Marca Package List: 1 x Collimator 1 x Lens Adapter 1 x Manual