Processor frequency: 1.2 GHz Platform: Microtek MTK 6572A Operating system: Android 6.0 'Marshmallow' RAM: 512 MB + 4 GB (optional: 1 GB + 8 GB) Extended memory: up to 32 GB: integrated SD card (use a high-speed SD card for better performance) TP screen display: IPS 2.45" 240 * 320: Works with the "capacitive" touch screen stylus. Input power: 12-24 V: Works perfectly from a regulated DC power supply or an external battery from 8.4 V DC to 24 V DC Internal speaker: 45 mm diameter speaker, 4 W Headphone port: 3.5 mm jack. Note: Plugging in headphones into the headphone port on the left side of the radio does not cut off the internal speaker USB: 5-pin Micro USB socket (for data cable / OTG cable) Microphone: External 'fist mic' plug-in. Condenser microphone element with PTT switch and 8-conductor shielded coiled cable. Microphone plug type: 8-pin 'RJ45' Microphone plug wiring: Pin # 1 GND: Pin # 2 AF mic input: Pin # 7 PTT (1k resistance to GND): Pin # 8 + 5V DC output. RF network bands: WCDMA / HSPA / HSPA+ band 1 2100 MHz GSM / HSPA / HSPA+ band 8 900 MHz + GSM 1800 MHz support Maximum RF output power: GSM / HSPA / HSPA+ 900 MHz -32.2 dBm (602 femtowatts) GSM 1800 MHz -30.3 dBm (933 femtowatts) WCDMA / HSPA / HSPA+ 2100 MHz -23.5 dBm (4466 femtowatts) WIFI: ISM 2.4 GHz band IEEE 802.11b / g / n (up to 150 Mbps) Dimensions: 188 mm x 58 mm x 26 mm