Plantronics Savi W430, W730 replacement/spare headset. This is the spare headset in case you lost or broke your Plantronics headset (or you are using it in a multi-shift environment). It si compatible with: Plantronics Savi W730 , Plantronics Savi W430 and Plantronics Savi W430-M, but it will not function without the Savi W430, W430-M, or W740 base. It will sync up with your existing W430, W730 amplifier/charging base. Comes with battery and charging cradle included.