Due to the convenience of deleting unwanted photos and inexpensive media storage, we take a lot more photos than the film era. Today's digital camera puts a lot of stress and loading on the battery, hence the battery grip becomes an essential accessory to most of us. Jenis battery grip uses the same build material as the original manufacture on all its product lines, to ensure a long time trouble free operation with your beloved digital SLR camera. The build quality and ergonomic not only matches the original equipment, there are some added functions on the higher end products that are designed with the professionals in mind. The extra features are not available either from the original equipment or the other battery grip on the market. The S model (Standard) provides the same function/capability as the original equipment. It can take up to two Li-ion battery or 6 to 8 AA batteries (depending on the model) to provide extra power reserved for longer shooting time. Depending on the camera design, some can also increase the continue shooting speed. There is an extra vertical shutter button to provide easy operation when shooting in portrait/vertical position. The control wheel provides the same functions as the original control wheel with easy access when operating in vertical position. The P model (Professional) has all the features in the S model but with some advanced essential functions. There is a clock which not only display time, but also serves as a self-timer or long exposure shutter control that can provide up to 99hr 59min 59sec delay time/B shutter. The SD model (Super Dual Storage) has all the features the P model has except the remote capability, but adds two extra high speed CF slots for people who like to take a lot of photos on a trip. A larger B&W LCD screen is provided to display some of the important shooting information. The grip also does some basic file operation. A high speed USB2.0 connection is also provided.