LG FR74-RB HRM Heart Rate Tracking Bluetooth Earphones (Refurbished) (FR74-RB). Keep up with all of your favorite tunes and your heart rate with the LG HRM Earphones. Providing HiFi sound and Bluetooth 3.0 connectivity, these earphones can track metabolic heart rate as well as maximum oxygen consumption (VO2 max) rate. Earphones are connected to a lightweight medallion that can clip anywhere, sending real-time information to the available LG Fitness app for iOS* and Android*. Display: LED light LG Fitness app compatibility: iOS 6 or later, Android 4.3 or later Music playback controls: Play, pause, previous/next, volume +/- Sensor: Optical sensor, Triaxial acceleration sensor Fitness tracking: Time, calories, distance, speed, pace, heart-rate, heart-rate zone Cardiovascular fitness measurement: VO2 Max Bluetooth: v3.0 Internal memory: 2MB Nor flash Battery: 200mAh Li-Po Battery life: Up to 4 hours when checking heart rate and playing music, up to 6 hours when playing music, 250 hours in standby mode Water resistant: Yes Features: Hands Free, aptX Sound Quality, voice guide, workout voice guide Brand: LG Model: FR74-RB Color: Black Dimensions: 2 inches wide x 1 inch high x 2 inches deep Weight: 1 pound *HRM Earphones are compatible with iOS 6 or later for iPhone and iPod Touch, Android 4.3 or later, and Android 4.2 for LG G2 and Galaxy S 4 only. This high-quality item has been factory refurbished. Please click on the icon above for more information on quality factory-reconditioned merchandise.