Description:
1. with fm 87.5-108mhz
2. with usb/sd aux slot
3. built-in microphone for hands-free phone calls 
4.Specifications:Bluetooth Version: V4.2Working range: in 10 metersSpeaker: 45mmSpeaker output: 3wSignal-to-noise: 9595dbBattery voltage/capacity: 400mahBattery charging voltage: 5v ± 0.5vBattery charge time: 2-3hoursGame time values for speakers: 4-5hoursDimension: 123mm * 46mm * 81mmGross weight: 300g