Infinity smart is a Bluetooth speaker with features like BT/ Micro SD /USB/TF card/AUX and comes with call function. It comes with an inbuilt microphone and FM radio. Apart from offers a complete hands-free experience and it comes with a rechargeable lithium battery.Bluetooth Version - V2.1 + EDROutput Power - 3W x 1Driver unit size - 3.8cm (1.5) x 1Frequency response - 100Hz-20KHzBattery capacity - 400mAhWireless range - 10 metersMicro SD card maximum size - 32GBPlayback time in BT mode - 1 Hours at maximum volume levelCharging via USB port - 4 hours