Mini Loudspeaker For Teachers Gadget For Giving Classes For Meetings $ 21.42 Product information: Frequency response: 150Hz- 12kHz Peak power: 5W Speaker impedance: 40 Total harmonic distortion: gah5% 1kHz @ 4R, 3W Signal-to-noise ratio: 77dB (A-Weighted) @ 1W 40 Battery Type: lithium ion battery Battery Specification: 3.7V/1300mAh Charging Method: DC 5V 1A Charging time: about 2 hours Usage time: about 8 hours Operating voltage range: 3.3V-4.2V Product Size: 193.1x60.7X60.7mm Vibration pickup: backpole Electret Directivity: Single pointing Frequency response: 60Hz-16KHz Sensitivity: -47 soil 3dB (0dB = 1V/Pa, at1KHz) Packing list: Amplifier1 Charging cable1 Instruction manual*1 Product Image:
