Thank you for viewing. This is the Vixen guide adapter GA-4. The instruction manual is included. This is a USED guide adapter. I lost the cap during astronomical observation, so I have stored it in a bubble wrap bag. Please refrain from purchasing if you are looking for a perfect item. Also, returns and cancellations are not accepted after the item has been shipped. Additional Information: I inserted batteries to check, as they were not included, and the guide lines were clearly visible. - Model: GA-4 - Color: Black/Silver - Application: Astronomical Observation