Electronics manufacturer Oppo on Wednesday launched its 4.5-inch display smartphone 'Joy 3' in India, at Rs 7,990. The dual-SIM smartphone is powered by a 1.3GHz quad-core MediaTek MT6582M processor coupled with a 1GB of RAM and Mali-400MP2 GPU. The device also features a 5MP rear camera, 2MP front-facing camera, 2000mAh battery and 4GB internal storage, expandable upto 32GB.