It supports text messaging, phone, GPRS data,HTTP protocol support, DTMF decoding, , recording function, Bluetooth, TTS function and so on Power supply: 5V-20V, please supply 2A or more current when using 5V power. Power supply interface: 2.54MM pin or MICRO-USB interface. Suitable for .<br><br>Interface: UART TTL level interface Baud rate: adaptive (default), support 2400-115200 SIM seat interface: MICRO-SIM stand Antenna interface: SMA, IPX antenna interface Working temperature: -45-80 Speech interface: 3.5MM voice Mike interface Size: 66 x 45.5 x 19.5mm Colour: blue + black Material: plastic<br><br>Package Contents: 1 x Development Board<br><br>Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.