The optional network for the walkie-talkie is CDMA2000 1X/EVDO or WCDMA 3G or EDGE with specific model number. It applies Low Bit Rate Speech Coding Technique (as low as 2.4kbps) and VOIP technology (Voice over Internet Protocol), ready to give users brand new experience of working in peers or groups without the hassle of noise interference or range limit, meanwhile mobile data usage remains in affordable range.