"Pentax Optio S4i Pentax packs a hefty 1.8-inch LCD monitor for larger viewing and focusing on the tiny Optio S4i digital camera. With 4.0 megapixels and a 3X optical zoom, this latest Optio digital camera also features the first Pentax digital cradle-style lithium ion recharge base unit. The rechargeable unit design makes it so easy to recharge the Optio S4i. Simply set the camera in the recharge base until it ready to use again. Featuring the legendary smc Pentax lens and the unique Pentax Sliding Lens system that allows the lens to retract fully when the camera is off lens, the Optio S4i is sleek and compact enough to carry everywhere. With the optional, acrylic waterproof housing that is newly designed for the Optio S4i, everywhere may well include the exciting world of underwater digital photography! For optimal results, the Optio S4i features both Marine Picture and Marine Movie modes to capture drama of blue underwater hues."