BlueAnt X5i - Manual (Page 11)

11 X5i Stereo Bluetooth Headset
Wearing the Headset Mounting / Removing battery
To mount battery, place hook of battery into groove of Headset
and when the terminals of battery and Headset are touching,
press battery downwards to lock completely.
To remove, press the “Battery
Ejector” button.
Place the Headset so that the neckband goes behind
the head and the ear hangers rest over the ears with
the top of your ears going through the gap.