Large Capaticy Rechargeable Battery - Built-in 360mAh rechargeable lithum battery. This presentation clicker can be fully charged in 2~3 hours and work for weeks Long Control Range - With the 328-feet wireless control range, you can move freely and also be ensured by advanced data loss control algorithms. When you make presentation in large classroom with more people or the USB receiver is seperated by walls or cabnet from the presenter, the long control range is more advantageous Functions & Customization - Support PowerPoint Hyperlink and volume control. You can reconfigure the key's function via Norwii Presnter software. By customization, this wireless presentation clicker can be personalised to meet individual functionality needs Support 1toN or 6to1 Control - Throuth pairing, you can use 1 Presenter control N devices, or use 6 presenters control 1 device. It's plug and play, just plug the USB receiver into your computer to start Plug & Play and Portable Des