DUAL-BATTERY MODE ---- This BG-1W battery grip is specially for Canon Mark IV. It can be installed with two original LP-E6/LP-E6N batteries or the batteries from third party. It can use one or two battery.</br>Strong Power High Efficiency --- It imports advanced battery management cell it can supply power in high efficiency with low power consumption. It can ensure shooting without the worry of power. It is indispensable for shooting.</br>MULTI-BUTTON OPERATION ---- This battery grip is equipped with shutter button in vertical position main drive plate and other buttons that can make the operation the same whatever shooting in vertical or horizontal position.</br>HIGH-INTENSITY SEALING --- Seal treatment of each part waterproof and dust-free.</br>One-Year Warranty --- Please buy and use it without worries. NOTE --- This battery grip BG-1W does not does not support use AA battery.</br></br>Product Description</br></br><p><b>Parameter</b> <p> <p>Battery : 1 or 2 of LP-E6 Battery <p>Power switch: Camera's Power switch <p>Working temperature: 0-40 <p>Working humidity: 85 Or Less <p>Dimensions: 153.4mmx85mmx116.4mm <p> <p><b>BG-1W Properties</b> <p> <p>1. It looks high end blends with camera . A battery grip equals to the one from orginal factory. <p>2. Keep improving to pusuit more excellent performance <p>3. The operation is set to be convenient??flexible and practical <p>4. On