Portable electronic receiver Compact Wave

Material: ABS. Analogue BTE, compact size Volume control 0n/off switch Max Sound output:130dB soil 5dB Max Sound Gain:50dB / 5dB Harmonic Wave Distortion: 65% Frequency Range:450~3500 hz The Input Noise: 30 dB or less Battery:AG5 Working Voltagedc1.5 V Current: 4 or less ma