And F4XT comparison, F5XT the following ways: 1 four car intercom 2. Intercom farther 3.FM Radio 4. Voice prompt 5 can be wired input source F5XT can and F4XT or F3XT intercom The world's first Bluetooth 3.0 bridge using Bluetooth technology Knight achieve four people simultaneously speak and listen to the car 4 And among the antenna into shape, not anecdotal models using exposed antenna * Original propaganda is: six six people on board to make peace while listening, but measured 5 to 6 people sound quality is poor, not recommended. Specifications: 1 Mike charisma separate, replaceable, with two kinds of microphones (Universal microphone and full cover type microphone) (2) two stereo headphones, the right earphone is removable, remove the right front seat rider headsets, to ensure rider safety. 3 supports A2DP (Bluetooth stereo), AVRCP (remote playback, searching around), RDS 4 can simultaneously connect two phones (Note 1) 5 Two Interphone F5 intercom distance of up to 1,300 meters, which can listen and speak. (Note 2) More than two intercom, the most distant as shown above. (Note 2) 6 maximum talk time 12 hours up to 700 hours standby charging fastest three hours Ultralight host. (Note 3) 7 Bluetooth specification V3.0 8 phone calls as the highest priority, the call ends back to the original mode 9. FM radio function (87.5 Mhz ~ 108 Mhz), can remember eight radio, support RDS 10. TTS voice prompts 11 can be wired external audio input, external audio devices with 3.5mm audio hole required 12 other versions of the same basic functions: VOX voice answering, DSP eliminate wind noise and automatically adjusts the volume, waterproof and dustproof IP67, receive GPS voice guidance. (GPS must have "passed the navigation voice" to a Bluetooth headset features, for example: Zumo550), contains two kinds of mounts Accessories: Clip and sticky style. Note 1: If two phone systems / Chip conflict, the Bluetooth headset can not connect two phones simultaneously and can not take the two intercom phone. No companion intercom only when the respective link two phones at the same time have companions intercom, only the respective link a phone. Note 2: The official value, means there are no obstructions in the empty place of mine, where the terrain and the environment will affect the actual radio interference sources intercom distance. Note 3: The official number, only using the intercom feature would be more Mao electricity, the use of time would be less 60 to 90 minutes, and use cases are not the same person. Note 4: F5 and the Tribe can mix use with F4, but the Tribe should make their own imports, and the Tribe for the radio, you can not speak and listen simultaneously. Note 5: When connected to a Interphone F5 or so for each concatenation operation, the station can not be followed by F5 mobile phones, namely four F5 intercom, The middle two units can not accept phone, head and tail only because even a 2 Interphone, it can still take phone. Note 6: GPS Connectivity Bluetooth headsets generally adopt HFP or A2DP mode. Mining HFP being disguised as cell phones, mining A2DP that masquerade as music. F5 has support HFP and A2DP, Zumo550 and Nuvi510 discontinued, existing foreign Zumo660/665...etc Some GPS can only connect the phone HFP, that masquerade as a Bluetooth headset. As smart phone GPS program, then see how to write the program. Note 7: F5 will remember the last two pairs of frequency interphone, because it can connect two interphone, namely the frequency of three, the first one will be forgotten.