Leeco Le 1S Eco X 509 the Android version 6.0 Marshmallow operating system now a days 7.0 running them this battery backup as a 3000 MH Lithium battery is a not a good battery the battery backup is is a not a good them this is a dual SIM to Nano SIM is a bad primary camera 30 MP is a good quality front camera 5mp is a not bad quality dual sim Fauji internal memory 32GB voice call is a not quality this mobile hot them issues voice issues