AfterShokz AS500SR Bluez 2S wireless open ear red stereo headphone features a bone conduction technology delivers music through your cheekbones, ensuring ears remain completely open to hear ambient sounds and LeakSlayer technology reduces natural sound leakage. AfterShokz AS500SR has OpenFit design ensures maximum situational awareness and comfort, dual noise canceling microphones exclude surrounding noise, enjoy six hours of continuous music + calls on a single charge and premium audio experience. AfterShokz AS500SR also features voice prompts guide users through power, pair, play and talk, Speaker type: bone conduction transducers, Frequency response: 20Hz~20KHz, Sensitivity: 100 � 3dB, Microphone: -40dB � 3dB, Bluetooth version: v3.0, Compatible profiles: A2DP, AVRCP, HSP, HFP, Wireless range: 33 ft (10m), Battery: rechargeable lithium ion, Continuous play: 6 hours Standby time: 10 days and Charge in: 2 hours. AfterShokz AS500SR Bluez 2S wireless bone conduction red headphone is brand new and comes in an original gift box.