Lenovo ThinkPad S1 Yoga is a convertible ultrabook that can be flipped complete at 360 degrees. It can be transformed from laptop to stand mode and tent mode to tablet. It is powered by Windows 8.1, with a 12.5-inch HD touch display. The device is available in 1TB HDD and SSD variants.

Lenovo ThinkPad T440 is powered by Windows 8 and is installed with a 14-inch HD touchscreen. The device comes with optional multi-touch capability and a trackpad that supports Windows 8 gestures, a company statement said.

Lenovo ThinkPad T440s comes with a carbon-fibre top that, according to the company, makes the ultrabook light and durable. The device is also installed with a 14-inch HD display. It is available in 320GB HDD, 1TB and SSD options. It runs on Windows 8 Pro.

As per the company, ThinkPad X240s Ultrabook is the thinnest and lightest full-featured ThinkPad in its entire series. The device is 17.65 mm thin and weighs 1.28 kilograms. It includes a VGA webcam, mini display port and two USB 3.0 ports for connectivity. ThinkPad X240s features a 12.5-inch HD touch display.

ThinkPad S1 Yoga is available at a starting price of Rs 80,000. While the ThinkPad T440 can be owned at Rs 78,000, ThinkPad T440s for Rs 90,000 and ThinkPad X240s at Rs 95,000.