Compatible with Windows or Mac OS Roaming range - Up to 30 meters (98 feet) Troubleshooting : For problems regarding the caller not hearing you ensure headset is paired and connected to your phone. • On iOS, check your audio output on your smartphone to make sure that the audio is directed to the headset and not another audio output. • Reposition headset on your ear as the sensors may not be detecting it is on. • Reset your sensors (following above instructions) as they may need recalibrating. • Disable your sensors as they may be incompatible with your specific ear shape. • Disable HD Voice (Wideband Audio) via Plantronics Hub application as this setting may be incompatible with your phone. I can't hear callers or music. • Ensure headset is paired and connected to your phone. • On iOS, check your audio output on your smartphone to make sure that the audio is directed to the headset and not another audio output. • Reposition headset on your ear as the sensors may not be detecting it is on. • Reset your sensors (following above instructions) as they may need recalibrating. • Disable your sensors as they may be incompatible with your specific ear shape. Some phones have less efficient Bluetooth connections and thus will not allow for an optimal talk time of 7 hours. The talk time remaining estimate is partly calculated by your historical use so inconstancies in an estimate may occur based on your particular use patterns.