FLASH : QSPL flash 4MB
SRAM: 520KB SRAM
Button : Reset
USB to TTL : CP2104
Working voltage : 2.7v-4.2v
Working current : About 60MA
Sleep current :About 120uA
Working temperature range :-40C-+85C
Size&weight :51.51*25.04*8.54mm(7.81g)
Power supply :USB 5V/1A
Charging current 500mA