The document compares the specifications of three smartphones: the Lenovo A6000, Micromax Yu Yureka, and Redmi 4G. The phones have similar 5-inch displays, quad-core processors ranging from 1.2-1.6 GHz, Android operating systems, rear and front cameras of 8-13 megapixels, 4G LTE connectivity, internal storage between 8-16 GB, microSD card slots, dual SIM card slots except for the Redmi 4G, and battery capacities between 2300-3100 mAh. The key differences are in processor speed, rear camera details, storage size, SIM card slots, and price, with the Redmi 4G being the most affordable under Rs