Model No. IN4-UP6SE Standard Frequency 1600Hz Frequency Range 200 - 8000Hz Max. Output Sound Level Gain (SSPL 50dB) 45±5dB 0~45dB Highest Sound Pressure Level for Input SSPL 90dB 117 ± 5dB Equivalent Input Noise Level Below 20 dB Total Harmonic Distortion Value 1600Hz: below 3%; 800Hz: below 4%; 500Hz: below4% Battery Current Below 0.7mA Battery Type / Life Expectancy P13 button size rechargeable battery. Continuous use: 12-16 hours per charge, 300+ recharges. Suitable Object General Use: Mild/ Moderate/ Severe Hearing Loss Special Made: Programmable for any audiogram Operating temperature / humidity +10°C ~ +40°C, 30% ~ 85% RH Storage temperature / humidity - 10°C ~ +60°C, 30% ~ 85% RH Size : 39mm(L)x30mm(W)x8.8mm(H) : 82mm(L)x42mm(W)x60mm(H) Weight : 3.4g; : 57g Material : ABS; : ABS; : ABS; : silicone