SONIC GEARS MINI SPEAKERS PANDORA MINI GREY Bluetooth wireless music playback Built-in FM receiver Built-in USB slot: MP3 music playback Built-in TF-card slot: MP3 music playback AUX-in audio output BLUETOOTH: Version: 2.1 + EDR Wireless distance up to 10 meters Support HSP, HFP, A2DP and AVRCP BUILT-IN RECHARGEABLE BATTERY: 400mAh lithium battery Continuous music playback (@50% volume): up to 4 hours operation Standby time: up to 24 hours Specification: Driver size: 2.5" Full range Frequency respone: 150Hz ~ 18KHz Impedance: 4Ohm Total system power: RMS 5 Watts 5-in-1 Playback Function: