■Bluetooth program: Jelly AC6963A4■ Bluetooth effective distance: ≥ 10m■Best call distance: within 10m■Headset maximum power ： 3mW■ Audio signal-to-noise ratio: S/N ≥90dB■ Frequency response:50Hz～20KHz■ Speaker unit: full-range titanium membrane speaker Φ13mm@32ohm■ Built-in battery: headset head lithium battery-3.7V, 30mAh rechargeable bin: 450mAh■Music time: about 4 hours (80% volume)■ Talk time: about 3.5 hours (80% volume)■Charging input standard: DC5V-500mA TAPE-C interface■Charging time: headphones: about 60 minutes for headphones, about 90 minutes for the charging compartment■ Battery cycle life Charging and discharging cycle ≥ 300 times after the capacity is 80% of the initial capacity■Sound system: stereo■ Bluetooth operating frequency: 2.402GHz-2.480GHz ■Reception sensitivity: 88dB±3dB &1kHz■Active and passive:Active■Size: Charging case size: 60X32mm diameterHeadphone size: 36X23X22mm ■Weight: 45g   ■Body material: ABS