Specification: 1. Using American Qualcomm MCU; 2. Small and exquisite shape and intestine Antenna ; 3. Supporting Voice calling , group message; 4. Communication Recorded, Telephone Book; 5. It can support at most 230.4kbps downlink communication rate; 6. Standard USB interface; 7. Personalization design and easy to operate. Main technical parameter Power supply: 5V ; Interface type: USB ; Dimensions:96mm X 34.5MM X 14MM ; Weight:26g ; supports the operating system: Win2000, XP,Vista ; transfer rate : 230.4Kbps ; Frequency: Transmitting 824MHz-849MHz; receiving 869MHz-894MHz. acceptor sensitivity: 104dBm ; stores temperature: -40 degrees Centigrade to 80 degrees Centigrade ; Working temperature: -30 degrees Centigrade to 60 degrees Centigrade .