Awesome Behind-Ear and Sweatproof: lightweight and neck-strap designed make you secure fit ears. Wearing like necklace is convenient to carry about after finishing running， jogging sports. As do look cool.Bluetooth v4.1 +EDRSolution: CSR 8635 Listen time: 7-9 hoursTalk time: 8-10 hoursStandby time: 320 hoursCharge time: 2 hoursBattery type: Rechnrgeable Li-ion batteryRange: Up to 10 metersSensitivity: -42 dB microphoneRF transmitter power: 90dB(more stable)Noise reduction: DSP and CVC 6.0Over-Charge/-discharge protetionMultipoint support enables connection to 2 phones