Basic Functions: 1. Suitable for CDMA 800 or 450 or 1900 MHZ frequency. 2. Support incoming call number display. 3. Pre-set area code, IP number, special service number, and any other head number. 4. Privilege setting for international distant and local call-in and call-out. 5. Wireless and wired channel switch, support two phone numbers (optional). 6. Indicator for signal, power and in-use function. 7. Billing support. 8. Support built-in battery storage. 9. Support external switch for group users. 10. Prevent from thunder attack. 11. Internet connection (optional). Characteristics: 1. High clear voice. 2. Rapid network searching, quick response for dialing, strengthened antenna, high sensitivity and harmless low radiation. 3. Adaptive to wide range of voltage with low power consumption. 4. Convenient installation on the desk or on the wall.