The Remax RB-M15 is Portable Fabric Bluetooth Speaker type speaker with 4.0 Bluetooth version.This Bluetooth Speaker built-in NFC function, simple fabric design, Hi-Fi quality and access to all devices with NFC function. In this Bluetooth Speaker, the frequency response is 20Hz-20kHz, Charging current is 500mAh, 3.7V, TF, Signal to noise ratio is 87dB. This speaker has the ability to connect wireless up to 10 meters away from your place.