About CALF CALF , the brand held by Changba Music Group for the whole global market, with a clear mission to make singing easier and make life better. Changba Music Group , founded in 2011, the first company launched APP for singing, totally changed users' singing habits. The app created new online karaoke scenarios through games, song sharing, etc. We strive to help all of music lovers, our mission is to lighten people's life with music. And we hope what CALF brand has been insisting on can inspire the world. We believe that everyone is able to achieve dream of being a singer or musician. Our products will engage more people to feel the power of music. The Red Dot Design Award The Red Dot Design Award, founded by the German design association Design Zentrum Nordrhein Westfalen, has a history of over 50 years and is one of the largest and most influential design competitions in the world, known as the "Oscars of the design world". It is known as the "Oscars of the design world". Karaoke Microphone Wireless Bluetooth TWS Easier and quicker to pair two G2 microphones via wireless connection, sing karaoke songs with your family and friends together Golden Pin Design Award Golden Pin Design Award, established by the Taiwan Creative Design Center, has a 40-year history in Taiwan and is the oldest, most authoritative and most prestigious professional design competition in Taiwan. Read more Kids-friendly Design The Rechargeable lithium battery gives you a long and uninterrupted performance- up to 7 hours. Light in weight, durable and seamless cute design provides kid-friendly using experience. Special Sound Effects There are 8 different sound effects in this karaoke microphone, which can make singing more interesting and make the kids happy.It is a wonderful gift for families, kids and friends. True Wireless Stereo With duet mode, you can connect two karaoke microphones together easily to play the same accompaniment and then you can sing the same song with your friends happily. Easy Operation Easy to adjust volume, sing and play music, which make you sing happier and more confident. Volume of microphone or accompaniment also can be tune easily with buttons. Read more Product Advantages: Developed based on big data algorithms of 450 million users. Customized DSP (Digital Signal Processor) audio processing chip. Karaoke technological breakthrough enabling TWS(True Wireless) duet. 8 different sound effects filtering your songs. Dual speakers, double bass/four-way surround sound. Long battery life: up to 7 hours of use. Customized DSP Technology Based on 450 million users big data in Changba app, CALF Speaker Microphone uses the customized DSP chip to beautify your voice and make your performance better. Anti Howling Technology The noise signal and the desired voice signal are processed to cancel the unwanted noise from the desired signal, producing improved voice sound quality. Honeycomb Hole Sound Design Unique design makes your voice clearer and louder. Suitable for karaoke party, home party, interviews, speech, small meetings and presentations, classroom lecture, etc. Read more How to use duet function? STEP 1. Two CALF G2 microphones(1 Red and 1 fluffy also available)，turn on both of them. STEP 2. Double click Power button of one G2 microphone to pair these 2 mics together, there will be a voice prompt "duet sing on". STEP 3. Pair your mobile device to the G2 microphone via Bluetooth, 2 mics' speakers will be working(singing or playing music)at the same time when you singing or playing music. STEP 4. Double click Power button again to turn off duet sing. Read more Product Parameters Main Chip Dual-core Digital DSP Bluetooth Version Bluetooth 4.2 Reverb Mode Reverb Digital Equilibrium EQ Adjustment Recording Mode Listen Wet, Record Wet RF Shielding Anti-cell Phone/SMS Interference Head Outer Diameter 14.0mm Head Type Capacitor Sensitivity -37dB Frequency Response 20HZ--20KHZ Directivity Super Cardioid Speaker Power 10W(2*5W) Battery Capacity 2600mAh Charging Parameters DC 5V 1A Weight 405g Speaker Impedance 4Ω