Features: 0.1dB resolution Volume stalls from 30 to 130dB Maximum lock function A, C, Z frequency weighted A, C, Z peak lock function Fast, Slow and Impulse time weighted AC/DC output signal Can be fixed on the tripod        Specification:  Applicable Standards& 65306;IEC 61672-1 Class 2, ANSI S1.4 Type 2  Digital Display& 65306;4-digit LCD  Measurement  Range:30-90dB, 45-110dB, 65-130dB  Resolution:0.1dB  Typical Instrument  Frequency Range:31.5Hz to 8KHz  Accuracy& 65306;± 1.4dB (ref 94dB @ 1KHz)  Dynamic Range& 65306;65dB  Frequency Weighting:A, C and Z  Time Weighting:F (Fast), S (Slow), and I (Impulse)  Microphone:1 / 2-inch pre-polarized condenser microphone  Analog output  AC output:1.0Vrms corresponding to each rang step, Impedance & 8786; 5KΩ  DC output:10mV / dB(nominally), Impedance & 8786; 5KΩ  Auto data memory:microSD CARD 4GB (1151)  Operating Temperature and Humidity;-10 ° C to + 50 ° C, 30% to 90% RH non-condensing   Storage Temperature and Humidity& 65306;-10 & 8451; to + 60 & 8451;, <70% RH non-condensing  Power Supply:One 006P 9V or IEC 6F22 or NEDA 1604 Battery& 65288;Not Included Package& 65289;    Battery Life:About 24 hours  Dimensions:246 (L) × 64 (W) × 26 (D) mm  Weight:180g  Accessories:Manual,  carrying case, 3.5f headphone head, adjustment screwdriver, windshield, CD software disc, micro-USB cable   Optional Accessories:AC adaptor DC9V