... 1~-107.9MHz) selection, digital display mirror display frequency, RF output stably, more frequency for selection, without interference problem.8, Equipped with ... and A2DP 2, Working voltage: 12 to 24V DC 3, Frequency: 2.4GHz 4, Battery capacity: 1,700mAh 5, Standby time ... capacity: 60mAh 7, Earphone working time: 2 hours 8, FM radio frequency: 88.1 - 107.9MHz (optional) 9, Operating temperature: -20 to ...