What type of equipment is allowed during the presentation?

Battery-powered devices are allowed during the presentation because they typically offer more flexibility and portability compared to electric-powered devices, which often require a direct power source. This is particularly important in presentation settings where access to outlets may be limited, or where the use of extension cords is impractical. Battery-powered devices can enhance the delivery of presentations by enabling the presenter to move freely without being tethered to a power outlet, which can facilitate a more engaging and dynamic interaction with the audience. Additionally, they are usually designed to be user-friendly, minimizing technical issues that might arise with electric-powered devices dependent on external power sources.

The other options suggest various equipment allowances that may not provide the same level of flexibility or could require specific conditions that might not be feasible in all presentation environments.