Mini bluetooth headset Characteristics Model: JI002 Bluetooth Version: V5.0 Speaker impedance: 32Ω/Ф10mm Reception sensitivity: 106 dB Maximum operating distance: 10 meters Audio signal-to-noise ratio: ≥90 dB Frequency Response: 2.402 GHz-2.480 GHz Built-in battery: 40mAh Talking/music time: 4 hours Charging time: 40 minutes Supports wireless protocol: HSP/HFP/A2DP/AVRCP Button functions Power on: Long press the multi-function button for about 2 seconds to power on Power off: Long press the multi-function button for about 3 seconds to power off Pairing Mode: Long press the multi-function button for about 5 seconds to enter pairing state Answer/hang up: press the key Call rejection: When a call comes in, press and hold for 2 seconds Redial the last number: Double-click the button Play/Pause: Click the button Voice mode: Press and hold for 2 seconds Device name for bluetooth pairing: JKD-NM Switch between Chinese and English: Double-click twice to switch between Chinese and English when pairing