2017 R4ISDHC Dual-Core has been completely updated with more functions and mature technology, which is the best sellers among all R4. It combined with core technology of R4, M3 and DS TWO. RTS (real time save) function is added. High-density chip was used to enable the games run more faster and last longer. The chip has better appearance and better Micro SD compatibility. The plastic case structure is more precise.