Thank you for viewing. I am selling this box viewer (underwater viewer) because I no longer use it. It's a wide-size box viewer that's easy to see through. It has been used a few times, so please understand that there are some scratches. There are no problems with its use. Thank you very much. ~~Product Overview~~ An aquarium anywhere! Long and wide field of view! You can thread a string through it if you like! ● How to use: Put your hand through the handle on the side of the main body, put the lens part into the water, look down from above, and observe the underwater creatures. ■ Product name: Octopus Glasses Long Y-101 ■ Size: Approximately width 280mm x depth 205mm x height 355mm ■ Product weight: Approximately 730g ■ Material: Body: Polypropylene, Lens: AS resin