Specifications Bluetooth-compatible version: 5.0 Bluetooth-compatible transmission distance: 10 metersHeadphone channel: stereo (2.0)Music playback time: 7H for loud sound, 10 hours for medium volumeMicrophone distance: 1 meterBluetooth-compatible standby time: 72HCharging time: 1-2 hoursBattery capacity: 150ma/hBattery power: 0.55WSpeaker impedance: 32 ohmsSpeaker power: 0.02WFrequency range: 2.4-2.4835GHzSensitivity: 45dbTransmitting power: 6dBAudio output distortion: 0.6%Audio output signal-to-noise ratio: 93dBLarge input voltage: DC 5VMaximum input current: 150mahLarge input power: 0.55W Features: Supports listening to music and answering calls, compatible with iOS, Android, WP systems, and can be used as long as the device has Bluetooth.Ergonomic design, very sturdy and lightweight, can be worn in the ear even during intense exercise, and will not feel uncomfortable after long-term use. Perfect for sports, training, and running. Package list Single weight: 80gSize: 27cm*10cmPackaging accessories: Bluetooth-compatible headscarf, user manual, charging cable, OPP bag Note:1.We don't offer retail package,but we will pack it well before shipped out.2.Please allow 0-1cm error due to manual measurement. plz make sure you do not mind before you buy.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!