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Do you know RB689 long range radio with bluetooth headset?

Do you know RB689 long range radio with bluetooth headset? RB689 is a long-distance Bluetooth walkie-talkie, it has 16 channels, and the frequency band is 400-470mhz. The battery capacity is 2600mah, and the charging time is about 6.5 hours, it can support more than 10 hours of working time and longer standby time. Its antenna

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