This phone is the L8star BM10 mini phone. Functions: It works with two SIM cards (Dual SIM) and can be used as a Bluetooth headset for other smartphones. Features: It has a built-in voice changer, an MP3 player, and FM radio. Screen and Battery: A small 0.66-inch screen and a 350 mAh battery. Size: It is marketed as one of the smallest phones in the world, approximately thumb-sized.