Zen Mobile has launched the M25 handset that comes with 72 days of battery back-up. Priced at Rs 3,400, the handset supports two GSM SIM cards and comes with a 1.3 megapixel camera, a TFT screen and storage capacity for more than 500 contacts. Its other features include English and Hindi support, Bluetooth connectivity, an FM recorder and expandable memory of 4 GB.