Thank you for viewing this product. Product: ・Duct rail fixer length extension parts x 2 ※Extension parts (4.7cm) can be purchased additionally for 400 yen per piece. If you wish to purchase more, please comment. I will create a dedicated listing for you. ＜Examples of compatible models＞ ・BOSE SOUNDLINK REVOLVE / REVOLVE+ / REVOLVE 2 / REVOLVE+ 2 ・SONY SRS-XB501G ・Amazon Echo (4th generation and later) ・Anker Nebula Vega Portable, Astro, Capsule ・XGIMI MOGO / MOGO PRO / Halo / XGIMI Halo+ Etc. ＜Usage scenarios＞ Dolby Atmos speaker configuration Pet / CCTV / Bird's-eye view camera Home projector, etc. *Due to postal size and weight restrictions, the item will be packaged in a clear pocket and shipped in an envelope. *We will ship the item on the same day if possible, or within the next day at the latest. *No price reduction *Instant purchase OK If you have any questions, please feel free to comment. Thank you for your consideration.