PARAMETRIC 3 BAND EQUALIZER electric bass active or passive electronic amplifier circuit Product description SE3P features a pre-wired balance control, master volume, Bass and treble on separate potentiometers with the mid band control and Frequency Range Shift on one Concentric Pot. Each control pots are designed to connect to PCB by a connector, which make SE3P installation easier and versatile. High Impedance Input design can match with any Active and Passive Pickup and also Low Impedance Output will keep the same tone from your guitar to any amplifier system without losing high frequency response. Using advanced Surface Mount Technology could reduce unwanted sound (Noise) while increasing sound quality and it's reliability. ARTEC guarantees a virtually noiseless sound with long 9 V battery life. (more than 2000 hours in continuous use. workable voltage : drop down to 2.2 V). SE3P-A features SE3P with Concentric Potentiometer, which is Bass and Treble eq's on one Concentric pot. Application : Electric Basses, Electric guitars Piezo pickup equipped instruments. Technical Specifications : Bass : +/-12 dB at 100 Hz, Middle : +/-12 dB at 400 Hz ~ 2 kHz, Treble : +/-12 dB at 4 kHz, Balance : MN500K Potentiometer Current : 0.32 mA Voltage range : 6 V ~ 22 V Battery : 9 V Alkaline Payment: We only accept Paypal. Shipping: Once payment has been confirmed, your item will be shipped within 2-3 business days.After the packages are shipped, the seller will provide the tracking number to the buyer. Normally it takes about 7-15days to arrive. Shipment: If you can are from South American or other, Pls contact to us . Once payment has been confirmed, your item will be shipped within 2-3 business days.After the packages are shipped, the seller will provide the tracking number to the buyer. Normally it takes about 3-8days to arrive. Terms of Sale: If you are not happy with any item, please contact us within 14 days of receipt so that we can arrange for an exchange or refund. After getting the returned item,we will refund the customer at the item?s price.You will pay a 25% restocking fee. Contact us : We are always willing to help and if you need any advice pls feel free to email.