Washington, Sep 3 : Chinese mobile company Xiaomi recently sold out 40,000 units of its new Redmi 1S in just 4 seconds.

This flash sale has upset many Indian customers, who took it to Facebook to complain about the limited stock of the smartphone.

Earlier, Xiaomi Mi3 created similar hype with flash sales ending in seconds.

The company itself claimed the phone sold out in 4.2 seconds. Registrations for its next flash sale will open at 6pm India time today, CNET reported.

In India, Xiaomi has partnered with e-commerce retail site Flipkart to sell its devices. The site uses registrations of interest to provide a virtual queue for users to make purchases and so far, the demand for the Redmi 1S far exceeds supply with over 250,000 users wanting to buy the new phone, report said.

The Redmi 1S is the follow up to the Redmi, an Android phone that offered exceptional value for its low price. The Redmi 1S comes with a new Qualcomm Snapdragon 400 processor clocked at 1.6GHz and twice the storage space at 8GB. The smartphone still has an 8-megapixel rear camera and a 4.7-inch display with an HD resolution of 1,280x720 pixels, the report added. (ANI)