Tennisland is an online retail store operated under the name TENNISLAND SARL, offering bicycles, e-bikes, cycling accessories, and electronic equipment. Its catalog includes bicycles from brands such as Cube and Radon, alongside products for e-bike use and maintenance. Shoppers can also browse bike computers, locks, carriers, trailers, lighting, batteries, and other cycling accessories. The store highlights Garmin products and lists devices such as GPS watches and cycling computers, as well as Bosch displays and batteries.

The website also features a selection of other equipment, including lawn mowers, robotic mowers, and a pool-cleaning robot, so its inventory extends beyond cycling. Customers can shop online, create an account, save items to a wishlist, and compare products. The store advertises free shipping on orders over €100, secure payments, and returns, with delivery across Germany stated as one to five business days. Customer service is listed as available Monday through Saturday, and the site provides contact details in Pontault-Combault, France.