CALF specializes in high-fidelity wireless speaker microphones and portable karaoke solutions designed by Beijing Changba Technology for mobile entertainment.
CALF is a consumer electronics brand operated by Beijing Changba Technology Co., Ltd., dedicated to revolutionizing personal music entertainment. The brand specializes in portable wireless speaker microphones that integrate professional audio technology into handheld devices.
With a focus on "singing anytime, anywhere," CALF products leverage dual-core digital DSP technology and customized high-fidelity speakers to deliver studio-quality sound effects, reverb, and noise cancellation. Popular models such as the G2 and M1 are designed for seamless connection with mobile apps, supporting wireless karaoke, duet modes, and high-quality recording.
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To use Duet Mode, turn on two CALF microphones and disconnect them from other Bluetooth devices. Press and hold the designated button (often the volume+ button or sound effect button, depending on the model) until you hear a prompt saying 'Duet Mode on'. Then, connect your smartphone to the device via Bluetooth.
Connect the microphone to a mobile power bank, computer USB port, or a 5V/1A power adapter using the provided USB cable. The indicator light typically turns red during charging and turns off when the battery is fully charged.
Generally, the wireless singing mode via Bluetooth does not support the song-recording function. For high-quality recording, it is recommended to use the Wired Song-Recording Mode by connecting the microphone to your phone via the audio cable.
CALF products are typically covered by a 12-month limited warranty from the date of original purchase, covering quality defects for products sold by authorized retailers.