The EQ-7545R is a professional and practical pickup equalizer system with 4 bands, which can be easily fitted into your acoustic guitar, and is essential to and amplify their sound. It is pre- for easy assembly, and supplided with a battery box. Features - Model: EQ-7545R. - ColorBlack - Shell material: durable hard plastic and metal. - and 4 Bands Acoustic Guitar Piezo Pickup Preamp Amplifier Equalizer Tuner. - Acoustic Guitar Piezo Pickup Preamp Amplifier with 4 bands can be easily fitted into your acoustic guitar and it is essential to and amplify their sound. - Under the saddle pickup for acoustic guitar. - Pre- for easy assembly. - 4 bands plus volume control. - Supplied with a battery box, indicator(battery not included). - Connecting wire with 2.5mm plug. - Warning when the battery voltage is low. Specifications - Presence control: ±12dB at 8KHz. - Bass control: ±12dB at 600Hz - Middle control: ±12dB at 600Hz - Treble control: ±12dB at 2.2Hz - Frequency response: 20Hz - 20kHz - Power: 1 * 9V alkaline battery (not included) Package list: 3 * EQ-7545R 4 Bands Acoustic Guitar Piezo Pickup Preamp Amplifier Equalizer Tuner (Black) 3 * Connecting Wire with 2.5mm Plug 3 * Mounting Base with Sticker 12 * Mounting Screws