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SONY WI-SP500 Sports In-ear Headphones Wireless freedom with Bluetooth® technology and NFC 0.53" open-type drivers let in ambient sound Lightweight behind-the-neck design with secure fitting Splash-proof and sweat-proof with an IPX4 rating Up to 8 hours of playback Battery Charge Time Approx. 2.0 hrs Battery Charge Method USB Battery Life (continuous music playback time) Max. 8 hrs Battery Life (Waiting Time) Max. 200 hrs Frequency Response (Bluetooth® Communication) 20 Hz–20,000 Hz (Sampling frequency 44.1 kHz)4 plz check here: https://www.sony.com/electronics/in-ear-headphones/wi-sp500/specifications tnx for call me |