i9 Wireless TWS Sport Bilateral Stereo Bluetooth 5.0 Headset with Charging Box, Push-button Version(White) Product parameters Bluetooth Solution: Actions RL5003 Bluetooth version: Bluetooth 5.0 Playback power consumption: 0-14mA Call power consumption: 8-13mA Standby current: 0.36 Receive sensitivity: -85dBm Audio signal to noise ratio: 94dB Noise reduction: DSP intelligent noise reduction Product net weight: 39g With packaging: 95.4g Sounding unit Type: Custom version 10MM true copper ring HIFI unit Acoustic structure: closed Magnet type: NdFeB Frequency response: 20Hz-20kHz Sensitivity: 112dB Output power: regular 3mW, maximum 5mW microphone Type: MEMS Digital Silicon Number of channels: two channels (stereo) Sensitivity: -42 Battery Single ear power: 40mAh Charging capacity: 250mAh Play time: 3 hours The charging compartment can charge the headset 2 to 3 times, and the total battery life is 12 hours. Instructions for use After receiving the goods, take out the earphones, the earphones will automatically turn on; the left ear flashes blue light every 5 seconds, and the right ear red and blue lights alternately flash. Turn on the phone Bluetooth, search for "i9-5.0" and click the connection to use