[Wide Compatibility]Universal suitable for Garmin varia series radar tail light and edge series cycling computer, and for iGPSPORT GS cycling computer, also can be a holder for Airtag. [Fit Different Size of Seat Post]Comes with 2 different size of rubber inserts, makes it widely fit for most bicycle, you can install the mount separately to the thicker seat post or install it with rubber insert to a thinner seat post. [Easy to Install with Included Tools] Wrench and Screws are included, convenient to mount your radar tail light or GPS cycling computer on the seat post or handlebar of your bicycle, increase the ride safety. [Stable and Safe]The mount is held on the bicycle securely by 2 screws included, can be fixed on your bicycle firmly, no worry of loose when riding. And shock absorbing rubber inserts is soft, anti-slip and scratch-proof, keep it stable on your bicycle and not easy to shake. [Designed with a Hidden Holder for Airtag] This is a version that increase a housing for Airtag, allow you to place tracker in the bracket with hidden positioning, protect it and do not block the signal of the anti-lost device. You can still install your tail light or cycling computer normally after place the tracker. Colour:black Material:ABS Package Contents: 1 x bicycle saddle 2 x screws 1 x screwdriver