The Sigma PG-31 Power Grip for SD1 Merrill DSLR Camera is made for extending your shoot time. This power grip comes with two power slots for BP-21 Lithium-ion batteries. Also, it allows you to shoot with one battery while the other is removed for charging. You may shoot while holding the camera vertically, thanks to the shutter button incorporated in the power grip. Further, this grip is designed with an anti-slip rubber that ensures stability. You may also attach the power grip-fitted camera on a tripod. Also, the camera’s contact cover is firmly kept in place by the integrated holder in the power grip.