Description: This is 10 Segment LM3915 level indicator board (Assembled). Board with an level amplification(use 741 single operational amplifier), there have high and low two group input. It can be used for pre-amplifier output level indication. 11PCS 3mm LED lights, 10pcs LED used for level indicating, 1pcs LED used for power indicator. colour assortment: 7pcs Green color, 3pcs Yellow color, 1pcs Red color. Specifications: Power Supply: for DC 12V 250mA Input sensitivity: Low input: 150mV to 6V rms (47K) High input: 1.5V to 60V rms (470K) Board Size: 6.9x3.4cm/2.72x1.34" Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Includes: 1 x LM3915 10 LED o Level Indicator(Assembled)