Model: 450BT-B Audio input: 3.5mm jack type Speaker horn: 40mm steel magnet Sensitivity: 115±3dB Withstand power: 25mW Frequency range: 20-20KHz Impedance: 24Ω Microphone: support Frequency range: 30Hz-16KHz Sensitivity: -58±3dB Bluetooth version: V5.0 Transmission protocol: EDR+A2DP Transmission coding: SBC Noise reduction technology: DSP+AEC Frequency range: 2.402~2.480GHz Effective transmission distance: 10 meters Transmit power: 5dBm Battery capacity: lithium battery 200mHA Charging current: 5V 500mA Charging time: <1 hour Use time: ≥5 hours Standby time: ≥1000 hours MicroSD/TF card: support up to 32G, support play/pause/previous/next FM listening: Support FM full frequency search and save frequency Head bow: PP External film: ABS (logo can be customized) Arm: ABS Bowl: ABS Gold sheet: aluminum sheet (logo can be customized) Button: ABS Earmuffs: leather Packing list: headset host, instruction manual, blister, packing box, Micro USB charging cable, 3.5mm audio computer cable.