Features: 1. 4G+VOIP dual-mode fixed line, SIP line, 4G full Netcom, voice mail, call transfer, handheld phone 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. Back clip design, can be disassembled at any time 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. Support TF card recording Insert the TF card, turn on the automatic recording in the VOIP setting or manually click to start recording during the call, the recording file can be saved to the TF card 14. Do-not-disturb mode can be set, when someone calls in, it will not ring, but the call information will still be recorded 15. Turn on the WIFI function, you can quickly and easily find the WIFI signal and connect to the network 16. Mobile office, free to move around anytime and anywhere, automatic network switching 17. Use the 4G card traffic to turn on the portable WLAN hotspot, and other devices can quickly and easily find the hotspot signal 18. Web-side remote management: support remote management of the browser (port number 8080), and the computer can remotely log in to the phone through the browser to complete various settings such as initialization settings and maintenance 19. Equipped with 1000mAh large-capacity detachable battery, long-lasting battery life, 100 hours of standby time, and 5 hours of talk time 20. Durable, strong power, rechargeable battery, recycling 21. The shrapnel design of the charging base Parameter: 1. Platform: 4G LTE five-mode 2. Screen size: 2.4 inches 240x320 resolution 3. SIP line: standard 3 lines 4. SIM card: dual SIM card 5. 4G network: single 4G network 6. Built-in WIFI, built-in Bluetooth, intercom function, TF card 7. Audio coding: G.722 / GSM / PCMA / PCMU / G.729AB / iLBC / AMR / DTMF / ISACWB / ISACSWB / OPUS 8. Scope of application: home, office, medical care, hotel, catering, transportation, etc. 9. Audio conference: 3-party audio conference 10. DTMF: In-band, SIP INFO 11. Power supply mode: USB charging/built-in lithium battery 12. Battery capacity: 1000mah 13. High-fidelity sound quality: HD hands-free HD handle 14. Handle interface: RJ-9 15. USB port: Micro usb OTG 16. Power input: 5V 1A Configuration management: 1. Support TFTP/PnP/DHCP/one-key update automatic deployment 2. TR069 remote configuration Cyber security: 1. Support UDP/TCP/TLS 2. Automatic date and time synchronization via SNTP Phone function: 1. Add/delete contacts, missed call reminder 2. Do Not Disturb, Auto Answer 3. Call forwarding/busy forwarding/unconditional forwarding