Plantronics Savi W430, W730 replacement or spare headset. This is the spare headset in case you lost or broke your Plantronics headset (or use in a multi-shift enviornment). It comes with a charging cradle and battery included. It will not function without the Savi W430, W430-M, or W740 base. You can use it in a multi-shift environments. It will sync up with your existing W430, W730 amplifier/charging base.