XO Headphones BS28 Trekz Air Wireless Sports Headphones Workout Headphones Bluetooth Headphones Very lightweight

“Bluetooth version: Bluetooth V5.0 BK3266
Support Bluetooth protocol: A2DP v1.3, AVRCP v1.6, HFP v1.7, HID v1.1, AVCTP v1.4, AVDTP v1.3, and SPP v1.2
Bluetooth operating frequency: 2.402GHz-2.480GHz
Receiving sensitivity: -89dBm
Bluetooth effective distance: :Rating 3-5mW
Headphone RF power level Class2
Headphone amplifier type: chip built-in
Audio signal-to-noise ratio: S/N ≥92dB
Frequency response: 50Hz～20KHz
Speaker unit: real copper ring full-range speaker Φ10mm@16ohm
Microphone MIC MEMS, condenser microphone, -42dB+-2,
Built-in battery: Lithium battery -3.7V, 150mAh, + protection board
Standby time 7-8 days
Music time: about 11 hours (70% volume)
Talk time: about 11 hours (70% volume)
Charging input standard: DC5V-1000mA TPYE-C
Charging time: about 1.5 hours
Battery cycle life: charge and discharge cycle ≥300 times
Main material: ABS+PC”