Model: 450BT-BAudio input: 3.5mm jack typeSpeaker horn: 40mm steel magnetSensitivity: 115±3dBWithstand power: 25mWFrequency range: 20-20KHzImpedance: 24ΩMicrophone: supportFrequency range: 30Hz-16KHzSensitivity: -58±3dBBluetooth version: V5.0Transmission protocol: EDR+A2DPTransmission coding: SBCNoise reduction technology: DSP+AECFrequency range: 2.402~2.480GHzEffective transmission distance: 10 metersTransmit power: 5dBmBattery capacity: lithium battery 200mHACharging current: 5V 500mACharging time: <1 hourUse time: ≥5 hoursStandby time: ≥1000 hoursMicroSD/TF card: support up to 32G, support play/pause/previous/nextFM listening: Support FM full frequency search and save frequencyHead bow: PPExternal film: ABS (logo can be customized)Arm: ABSBowl: ABSGold sheet: aluminum sheet (logo can be customized)Button: ABSEarmuffs: leatherPacking list: headset host, instruction manual, blister, packing box, Micro USB charging cable, 3.5mm audio computer cable.