Modem: 
RDA 8955L

Form Factor:
LCC  18.7*16.0*2.3mm

Bands:
GSM: 850/900/1800/1900MHz

Speed: 
GPRS: Multi-slot class 12 (4Rx/2Tx)
Max DL/UL 85.6 Kbps

nterfaces:
USIM: 1.8V/3.0V
UART x 2
Analog Audio x 2
Camera
LCD
ADC x 2
I2C
SD Card Interface

Temperature:
Operating: -40 to +85 ℃
Storage: -40 to +85 ℃