Carex™ Ultra Grip 12in Bath Suction Grab Bar

From the manufacturer's website:

The Ultra Grip Grab Bar assists users entering or leaving the bathtub or shower. Its strong suction grips hold tightly to any smooth, flat, and non-porous surface. The bathroom grab bar features a visual indicator that changes from red to green to show when the bar is properly secured into place. No installation is required. 

• Powerful dual-locking suction cups. The shower safety bar's suction cups make it convenient and easy to install. No need to hire someone or use any power tools to install the bathroom safety bar.
• Indicates when the bathtub safety bar is properly fastened. A significant drawback for most suction cup shower handles is not knowing when they're fastened. This can lead to injury. Our tub safety bar features indicators that change from red to green to show when it's properly fastened to the wall.
• Excellent for travel. Because no tools are required, the shower safety handle is perfect for travel. Installing and removing the bathtub only takes a few seconds, making it the perfect portable grab bar.
• Works on most surfaces. The shower support bar easily attaches to most surfaces including shower tile and fiberglass. For best results from the shower handlebar, install on a smooth surface.
• Supports up to 250 lbs. The bathroom safety grab bar offers a reliable and dependable source of support. It can be easily removed and adjusted to a new position based on user needs.

Warning: Use caution on wet surfaces. Use to assist with balance only. Grab bars are not designed to support the total weight of an individual. Do not use to leverage body weight. DO not use to pull self out of bathtub. Users with limited physical capabilities should be supervised or assisted in bath and commode areas, even when using the grab bar. Must be mounted on a clean, smooth, flat, non porous surface. Clean the mounting surface and the suction cups before the first use and when necessary.

*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.