P04 WIRELESS PRESENTER ECHARGEABLE LASER PEN FOR PRESENTATION - WIth built-in 120 mAh rechargeable lithium battery, this slide changer with laser pointer lasts you a week of presentations with under 2 hours of recharge (under ideal conditions). You can also recharge it just before the presentation for 5-10 minutes and it will last you the whole presentation. No need to carry external batteries now. No more flimsy battery covers falling off. Laser Pointer Range 100m.