Kuulaa Mini Bluetooth 5.0 Headset Single in-ear earphone, minimalistic design Bluetooth V5 connection, high-fidelity sound quality and stable performance Built-in microphone, support hands-free phone conversation Multipoint connection: it can simultaneously connect two smartphones Built-in smart chip and CVC6.0 + DSP noise reduction function, clear phone conversation Support Chinese/English voice prompt for power on/off, pairing, incoming calls, low battery etc. Dual buttons to control on/off, previous/next song, volume up/down, answer / end phone calls and redial last phone call Silicone ear cap with ear wing, soft, comfortable and stable to wear Built-in 70mAh lithium battery, long standby time Support power display on iOS devices Specification Bluetooth version: V5 Working distance: 10m Working frequency: 2.402GHz - 2.480GHz Frequency response: 80Hz-20KHz Battery: 3.7V 70mAh lithium battery Charging time: 5 hours Music time: 5 hours Talk time: 5 hours Input: DC 5V/500mA~1A