VXi BlueParrott 204123 B250-XT 85 Percent Noise Canceling Bluetooth Headset 16 hours of talk time per charge Be heard clearly with the industry's best noise canceling. Compatible with Bluetooth cell phones and computers, Premium noise canceling microphone blocks out engine and road noise Wear all day, every day. Make your phone a walkie talkie with the VXi BlueParrott App. Push to talk to one person or a group on Android or iOS phones. SPL : 123 dB  3 dB at 1 mW. Impedance : 34   15 % @ 1 kHz. Speaker Frequency Response : 150 Hz to 6.8 kHz. Microphone : 6 mm bi-directional noise canceling Car charger sold separately under ASIN B00WKASR12