It supports text messaging, phone, GPRS data,HTTP protocol support, DTMF decoding, MMS, recording function, Bluetooth, TTS function and so onPower 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 Raspberry Pi.Interface: UART TTL level interfaceBaud rate: adaptive (default), support 2400-115200SIM Kaka seat interface: MICRO-SIM Kaka standAntenna interface: SMA, IPX antenna interfaceWorking temperature: -45-80Speech interface: 3.5MM voice Mike interfaceSize: 66 x 45.5 x 19.5mmColour: blue + blackMaterial: plasticPackage Contents:1 x Development BoardOnly the above package content, other products are not included.Note: Light shooting 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.