Plantronics Spare Base Deluxe Charging Kit for wh500/w440/w740 Plantronics® Deluxe charging kit allows to charge simultaneously while charging other and is compatible for the savi W440, W740, W720, W710, W730, W745. Plantronics® Deluxe charging kit is made of high quality raw material that provides durability. Charging kit measures 6.7 x 5 x 1.6 and is charges up to 5 units. - Spare Base Deluxe Charging Kit for the Savi W440, W740, W720, W710, W730 and W745 - Includes base deluxe charging cradle and spare battery - Up to 7 Hours Talk Time when Fully Charged