Bluetooth standard V4.1 conformity. CSR1010 chip Programmable general purpose PIO controller : Wide supply voltage range 1.8 to 3.6V. I2C for EEPROM and ICs peripherals. -90dBm Bluetooth low energy RX sensitivity. 12 digital PIOs 3 analogue AIOs 4 PWM modules Wake-up interrupt and Watchdog timer RoHS Compliant Small outline. 11 x 11x2.0mm Applications Sports and fitness Healthcare Automotive Home entertainment Office and mobile accessories