Features: 1. 4G+VOIP dual-mode fixed-line, SIP line, 4G full Netcom, voice mail, call transfer 2. 2.4-inch color screen design, strong color perception, clear viewing, and more comfortable use 3. Can register 3 SIP accounts, support account switching freely 4. Can insert 2 SIM cards, support 4G full Netcom 5. When either of the 4G phone and the VOIP phone is connected, the other party can also call in 6. Support Volte high-definition calls, you can imagine high-definition sound quality without the microphone close to the ear. 7. One-button hands-free calling, free your hands, chat freely, and do whatever you want 8. Support 3-party audio conference, you can add members to join at any time, making communication more convenient 9. 3 groups of fast dialing, 8 custom programmable function keys can be set to frequently used numbers, one-key call out, convenient for office and elderly use 10. Call transfer: In the process of making or answering a call, if you need to transfer the call, click the transfer button to transfer the call with one key, which is fast and worry-free 11. Call hold: During a call, if it is inconvenient, you can press the call hold button, the call will not end, press the hold button again, and the call will continue 12. Support voice message, voice message reminder, you can check the voice message at any time 13. Do-not-disturb mode can be set, when someone calls in, it will not ring, but the call information will still be recorded 14. Turn on the WIFI function, you can quickly and easily find the WIFI signal and connect to the network. 15. Plug in the 4G mobile phone card and turn on the mobile network, connect the phone to the computer that is not connected to the Internet through a network cable, and then the computer can use the shared network of the phone to access the Internet normally 16. Use the 4G card traffic to turn on the portable WLAN hotspot, and other devices can quickly and easily find the hotspot signal 17. Web-side remote management: support browser remote management (port number 8080), the computer can remotely log in to the phone through the browser to complete various settings such as initialization settings and maintenance Parameter: 1. SIM card: standard SIM card 2. LCD display: 2.4 inch color screen 3. WIFI AP: 802.11b/g/n2.4G 4. DTMF function: RFC 2833, SIPINFO 5. Network protocol: HTTP/TR069/RTP/SRTP 6. Phone book: support 500 contacts 7. Quick dial: M1-M3 2-9 number keys 8. Scope of application: home, office, medical care, hotel, catering, transportation, etc. 9. Voice message: unread voice message reminder 10. Call records: support 50 records 11. Power supply mode: USB charging/built-in lithium battery 12. Battery capacity: 1000mah Audio function: 1. G.722/G.729/AMR/AMRWB/GSM/PCMA/PCMU/SPEEX/ILB/DTMF/ISACWB/OPUS 2 Support high-quality audio calls 3. VAD/CNG/AGC/ANS/AEC SIP function: 1. Support SIP 2.0 (RFC3261) 2. Support 2-way SIP account 3. Support SIP UDP/TCP/TLS Phone function: 1. Add/delete contacts, missed call reminder 2. Do Not Disturb, Auto Answer 3. Call forwarding/busy forwarding/unconditional forwarding