Plantronics Savi W745-M created for Microsoft Lync 2010 wi-fi headset cell phones program. It's design so you can talk without ever running out of battery package energy package. It's a pre-bundle package that includes Savi W740-M + battery package energy package & Luxurious Charger kit. The Plantronics W745-M is a 3-in-1 wi-fi headset cell phones program that connects to multiple devices (PC, table mobile cellphone, and Wireless mobile phone), changing the way productivity-focused office professionals communicate. With multi-device connection, a newly designed sports sports convertible headset cell phones, and up to 350 feet of roaming range, now you can easily manage PC, cellphone and table telephone calls with this wi-fi headset cell phones program.