Max saturated sound pressure level: 110±5dB Full-on acoustic gain: ?30dB Harmonic distortion: ?10% Frequency range: 300 ~ 4000 Hz Equivalent noise: ? 40 dB Voltage: DC 1.5V Current: ? 4 mA Battery: 2 x AG3 button battery Size: 2 x 2 x 1.5 cm
1 x Hearing aid 2 x Button batteries 4 x Earbuds 1 x English user manual In original package