In wireless sensor network number of sensor nodes are deployed in an area and the key concern is to enhance the network lifetime and to minimize the energy consumption of the network by using some energy efficient techniques. To enhance the network life time there are many protocol Like LEACH, M-GEAR. This paper defines the overview of some energy efficient protocols (M-GEAR), The gateway based energy-efficient routing protocol (M-GEAR) for Wireless Sensor Networks (WSNs) divides the network sensor nodes into four logical regions on the basis of their location in the sensing field. This paper will give brief idea about M-GEAR
