The Plantronics BackBeat PRO Wireless Headphones with Mic allow you to make telephone calls and listen to your music from up to two multi-point connected devices such as a smartphone or tablet. The headphones utilize 40mm drivers to deliver Plantronic's signature sound with a frequency response of 20 to 20,000 Hz. The Bluetooth system uses the A2DP profile for high-quality audio with a transmission range of 330' and a continuous streaming time of 24 hours off a single charge. A set of external microphones can be used for active noise cancellation of background sounds or to mix external sound into the audio signal so you can talk to people or hear the environment without having to remove the headphones. Active noise cancellation can also be engaged for up to 60 hours without music playback when the listener requires quiet. Smart sensor technology automatically detects when the headphone are placed on the head or around the neck and can pause/play the music or answer calls accordingly. Audible status alerts such as for battery level or Bluetooth connectivity are provided in 14 different languages (US English, UK English, Cantonese, Danish, French, German, Italian, Japanese, Korean, Mandarin, Norwegian, Russian, Spanish, and Swedish). The headphones come with a ballistic nylon carrying sleeve, a USB-charging cable, and a right-angle 1/8" (3.5mm) audio cable with iOS in-line microphone and remote for situations when the Bluetooth battery has run out and you want to continue listening to music or making calls. The remote also supports play/pause on Android devices. Plantronics Signature Audio Provides crisp highs, natural midtones, and low-distortion low-frequency sounds that are tuned for all genres of music aptX Low-Latency Audio Codec Optimizes sound quality for audio streaming and minimizes lip-synch delays in videos when paired to an aptX capable device Dual Microphones Enhances vocal clarity when making calls and provides accuracy to voice-enabled services such as Siri and Skype Controllable Active Noise Canceling Uses multiple microphones to remove background noise from audio signal OpenMic Allows you to engage external microphones to mix and adjust the volume level of room noise into audio signal so that you can talk to people or listen to sounds in your environment without having to remove the headphones Battery Life Provides up to 24 hours of continuous streaming and up to 60 hours of silent active noise canceling, with five LED indicator lights displaying battery life Audio Cable Provides iOS in-line mic and remote control for functions such as volume, track forward/backward, and activating Siri in situations when the Bluetooth battery has run out. Also supports some functions on Android, such as play/pause Bluetooth Range Uses Class 1 Bluetooth Technology (V4.0) for steaming up to 330' (100m) away from your Class 1 Bluetooth smartphone or tablet Whispered Status Alerts Provides verbal alerts of connection status, battery, life, incoming calls and more in your choice of US English, UK English, Cantonese, Danish, French, German, Italian, Japanese, Korean, Mandarin, Norwegian, Russian, Spanish, and Swedish NFC Pairing To Compatible Android Devices Allows super-fast connection to Android phones and tablets with built-in near field communication technology Multi-Point Pairing Allows you to simultaneously connect the headphones to two devices such as a Bluetooth-compatible smartphone or tablet Smart Sensor Technology Answers calls/plays music by placing headphones on head and pauses music when removing headphones Comfort Uses cushioned telescoping headband with soft swiveling earcups to create an acoustic seal Headphone Controls Provides dedicated control over all major functions such as track and call controls, active noise cancellation, and volume Ballistic Nylon Travel Sleeve Accommodates headphones, USB charging cable, and angled 3.5 mm audio cable