Discover the power of DSC's BATT2.1-4.8V Battery, specifically designed for the WS4920HE Repeater and WTK5504 Keypad. This eco-friendly battery not only supports environmental sustainability but also offers efficient recycling due to its nickel content. It's uniquely sized for optimal reliability and performance, delivering a steady 4.8V DC to ensure your devices are always ready. With a substantial 2100 mAh capacity, it charges quickly and lasts longer, saving you time and hassle. Ideal as a spare, it provides peace of mind knowing your equipment will remain powered. Upgrade your device's performance and convenience with this essential accessory. Don't miss out, get yours today!