Specifications Material: Aluminum Color: Black, Gold Center Channel: 87dB Ultra Low Channel: 87dB Frequency Response/Music: 10-30KHZ Sound Quality Adjustment Range/Music Bass: +A10dB1H Microphone Bass: +/-10dB (100HZ) Treble: +/-5dB(10KHZ) Microphone: 20-15KHZ Microphone Squelch Threshold: Over-control Voltage 3MV, Start-up Time 3S Distortion: (1KHZ, 30MV) 0.03% Power Supply Voltage: AC110V/60HZ Packing Size: 55.58.830cm/21.853.4611.81in Product Size: 4819.54.8cm/18.97.71.9in Gross Weight: 2.5kg/5.5lbs Net Weight: 2kg/4.4lbs Package Included 1 Pre-stage Reverberation Effector 1 Power Cord 1 Bluetooth Antenna 2 Microphones 1 Battery Box 1 Chinese English Integrated User Manual Other Accessories for Use. Digital Mixer Household Karaoke Reverb Durable Stable Operatio Sound Processor. This pre-stage reverberation effector is equipped with multiple sound effect processors to ensure high-quality sound output. It is also equipped with a one-button anti-howling function to prevent the sound from collapsing, making it to be a piece of essential equipment for KTV, family entertainment and stage performances, etc. A high-quality aluminum shell ensures a long service life, and it will be your ideal choice! Robust and Durable : The housing is made of high-quality aluminum, which is robust, wear-resistant, rust-proof, and impact-resistant, effectively protecting the internal components and extending their service life. Professional Equipment: It is equipped with an exciter, equalizer, audio processor, feedback suppressor, effects, and mixer functions for better processing of vocals and backing vocals, giving you a professional-level experience. High-quality Vocals: With a built-in DSP dual digital reverb chip, it automatically corrects vocal deficiencies for richer, more natural, and clearer vocals. At the same time, its intelligent frequency calibration technology with a new type of noise reduction prevents frequency break-up, distortion, whistling, and crosstalk, ensuring a full, three-dimensional, high-quality vocal output. Anti-howling Technology: It uses advanced feedback suppression technology to fundamentally eliminate whistling interference while preventing sound collapse to give you a vivid and pure singing voice. Featuring a one-touch anti-howling button, it eliminates the need for debugging, making it convenient and practical. Input and Output : It can be switched to various input modes, Bluetooth, optical, or USB, using the INPUT button, so you can freely select and switch your favorite music. There are also multiple outputs, including a subwoofer output, a recording signal output, a center signal output, and a left and right channel model output for your daily needs. Easy Tuning: Three sensitive damping knobs and concealed operating knobs on the front of the unit make it easy to adjust the volume and parameters of the reverb, microphone, and music for a rich, immersive sound. Each part of the sound can be adjusted separately, giving you a wider vocal range and making it easier to sing well. Wireless Connectivity: The built-in microphone receiver, wireless Bluetooth module, and external Bluetooth receiver antenna with high interference immunity and stable signal allow music selection and microphone use over long distances without the hassle of cables. Stereo Sound Effect: With the bass, center, left and right channel modes, each zone can be adjusted independently to give the vocals a full, delicate and soft sound, giving you a full stereo feel. User-Friendly Design: The concealed operation knob is not easy to touch by mistake, and can be quickly and easily adjusted with a slotted screwdriver. In addition, with a memory function, each time it starts, it will automatically adjust to the last set mode to avoid the trouble of frequent adjustment. Good Heat Dissipation: The effector is equipped with multiple heat sinks for faster heat dissipation, resulting in long and stable operation. Customer Service: We aim to provide quality products and services. We will reply and solve the problem for you as soon as possible. Ultra Low Channel: 87dB. Sound Quality Adjustment Range/Music Bass: +A10dB1H. Microphone Bass: +/-10dB (100HZ). Microphone Squelch Threshold: Over-control Voltage 3MV, Start-up Time 3S. Distortion: (1KHZ, 30MV) 0.03%. Power Supply Voltage: AC110V/60HZ. Packing Size: 55.58.830cm/21.853.4611.81in. Product Size: 4819.54.8cm/18.97.71.9in. Gross Weight: 2.5kg/5.5lbs. Net Weight: 2kg/4.4lbs. 1 Pre-stage Reverberation Effector. 1 Chinese English Integrated User Manual. Other Accessories for Use. It is suitable for small-stage performances, family entertainment, promotional activities, business meetings, KTV boxes, restaurants, bars, and other entertainment venues. Please note that if fiber optic connection is required, your audio output device must have a fiber optic output connector. Please note that the package does not contain batteries. Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement, and make sure you do not mind before you order. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday. Made of high quality material, Durable? Unique Appearance, Great Durability. Compact Design, Convenient Use. Nice and Practical, High Quality Packaging.