The Rocelco Black DADRB-40-ACUSB Height Adjustable Sit to Standing Desk Riser and Converter offers the versatility you need to get through your work day. Now you can sit part of the day or stand to take advantage of all the health benefits that come with standing and moving around. With the 40" wide R DADRB-40-ACUSB, you and your associates will become healthier and more productive. It fits over your current desk with no need to buy additional furniture. With its spacious 40" W x 23.6" D work surface, you can hold up to 2 large monitors, a laptop, and more. It also includes an retractable keyboard tray that measures 25.5" W x 11.25" D that is an ergonomic 4.5" below the desktop. EVR Enhanced Vertical Range rises up to 20" and down to 5", to optimize the ergonomic work position for people of all heights. Straight up and down motion minimizes required depth (23.25"). Steel frame and gas piston assist allows you to easily raise and lower up to 40lbs. Grommet hole allows you to route cables or add an optional single or dual monitor arm such as the Rocelco DM2 or MA2.  Cable management channel at back routes your wires for tidy installation. AC-USB strip with 4 AC, 1 USB-C and 2 USB-A outlets, is mounted at back to power/charge all your devices. Fully assembled and ready to go! The included MAFM Anti-Fatigue Mat is designed to work in tandem with standing desk risers and will help support your back, hips, knees and feet so you can get all the benefits of standing while you work. The advanced multi-layer construction offers a comfortable “leather like" top surface, a memory foam inner layer and a non-slip bottom. A perfect 30" x 20" size provides plenty of room to move around, but still can fit into the kneehole of a standard desk or built-in when it is not being used. Beveled edges help to reduce tripping issues and ¾" commercial grade thickness provides hours of comfort and stability. The durable materials on this desk mat will not break down, even after years of use.

• Standing Desk Bundle includes 40" desk riser (R DADRB-40-ACUSB) and Anti Fatigue Floor Mat (R MAFM) in order to extend your health benefits in comfort and reduce joint stress and strain while you work, provides long standing comfort.
• Large worksurface - 40" by 23.5" desktop workstation can hold up to two 32" monitors, while 25.5" by 11.25" retractable keyboard tray can hold a laptop if needed and keep arms in ergonomic position to prevent strain while sitting or standing.
• Quick, easy and stable height adjustment - Sturdy metal frame with easy-grip side handle and gas piston assist, can raise and lower up to 40 pounds from 5.3" up to 20.6" above desktop. Straight up and down motion minimizes required depth (23.25").
• AC-USB Strip mounted at back includes four AC Outlets, one USB-C and two USB-A charging ports to power and charge all your devices along with a cable management system to tame your wires and keep everything neat.
• No assembly: Simply remove from box and place directly on existing desktop. One Year Warranty and we're always here to help. Licensed under U.S. Patent Nos. 9,113,703, 9,277,809, 9,554,644, 9,924,793 and other pending/issued U.S. and foreign patents

• Adjustability: 5-20"
• Desk Dimensions: 40"x23.6"