Bluetooth APRS Tracker, SainSonic AP610 PTT Talk Speaker for Baofeng GT-3 UV-5R, Kenwood, etc., Upgraded Version of SainSonic AP510 Tracker, Black Built-in Bluetooth Module: An upgraded version of AP510, one more wireless way for transmission. Interval Transmit Function - Connect K Radio Socket, suitable for Baofeng and Kenwood and so on. Built-in Bluetooth Serial Port Output - APRS data can be transmitted to phone, pad or PC. More Portable & Covenient: No need to bring one more microphone speaker with you for outdoor activity ANYMORE. TX VOL - TX audio modulation ensures high definition audio quallity.