Backlit LCD display with fast and slow time weighting. REED R1920 Offers This compact sound level meter measures sound. The R1920 features Data Hold and Min/Max functions and is designed for one-handed operation. Features Designed for one-handed operation High accuracy of ±1.5 dB Fast & slow time weighting Backlit LCD display Max, min and data hold functions Low battery indicator and auto shut off Included Sound Level Meter Windshield Ball 3 x "AAA" Batteries