THIS PHONE IS FULLY WATERPROOF. SONY XPERIA M4 AQUA PHONE IS GREAT LOOK AND FEEL BECAUSE THE SIDE ARE CURVED AND HAVE A NON- SLIP MATTE FINISH. THIS PHONE IS BOTH CAMERA QUALITY IS VERY GOOD(13 MP PRIMARY AND 5MP SECONDARY CAMERA). BATTERY PERFORMANCE IS VERY GOOD BECAUSE 2400 MAH BATTERY POWER. THIS PHONE CALL QUALITY WAS GREAT, AND LTE WORKED WELL. INTERNAL STORAGE IS 16GB YOU CAN ALSO EXPAND THE STORAGE IS 200GB.THIS PHONE PROCESSOR IS OCTA CORE VERY GOOD AND RAM 2GB .