Overview:

• On/off switch
• Volume Dial
• Mini Microphone
• Battery Cartridge (1 x AG13 cell, included)
• Two sized earbuds for personalized fit
• Max sound output: 129 +/- 5dB
• Sound gain >= 45dB
• Distortion <= 5%
• Frequency range: 300~4000Hz
• Noise <= 23dB
• Current <= 5mA (voltage 1.5V)

Specification:

• Weight Approx: 111g
• Size Approx: 4.3 x 0.8 x 14.7 cm