XO bluetooth speaker F19 is compact and wireless. Its design allows you to hang the device anywhere, so you can comfortably listen to music outdoors. The active Bluetooth interface allows you to listen to music sent wirelessly from a Bluetooth-enabled device (e.g. phone, smartphone, tablet).The XO F19 also functions as a portable speakerphone. Bluetooth: V 5.0 Range: 10m Sensitivity: -104dB SPL +/-3dB Battery: 400mAh Lithium battery Play music: 2.5 h Charging time: 1.5 h Charging standart: USB/DC5V-1A