Item Type: Amplifier Board Model: HF69B Supply Voltage: 5VDC or 3.7V lithium battery Applicable Speaker Impedance: 4 ohms, 6 ohms, 8 ohms Charging Interface: When using a lithium battery, the charging interface can be charged with a 5 volt power supply or a mobile phone charger to charge a single lithium battery.
Plug and Play device no software installation needed Easy and portable Works and all major operating systems Supports 5.1 Surround and 3D sound No external power supply needed Boost the signals for Headsets
Product: Adafruit Electret Microphone Amplifier ?? MAX4466 with Adjustable Gain Adjustable gain You can set the gain from 25x to 125x Excellent power supply noise rejection
Excellent durability and coexistence Guarantee the stability of Bluetooth transmission through multiple technologies Intuitive LED indication Bluetooth 4.2 Version Wireless transmission distance ?? 10 meters Adopt the latest Bluetooth 4.2 protocol, backward compatible with other versions of Bluetooth protocol
Comes with IR Remote Control Stereo Digital Audio Output Can be used as an audio receiver Support USB/TF Card Slot/Bluetooth/FM/AUX switching, also supports folder selection and playback Stereo Bluetooth with a call can also receive hands-free calls
Mini design, portable and easy to use. It is the audio-style connectors that you see on some phones, MP3 players, and development boards. Dimensions: 18 x 12 x 6(L x W x H) mm Weight: 2 gm
The board can be connected to two mobile phones. It comes with the call function and the default volume of the largest. Can be used for many applications like Bluetooth Headset
Sampling rates (kHz): 8/11.025/12/16/22.05/24/32/44.1/48 24 -bit DAC output, support for dynamic range 90dB , SNR support 85dB Fully supports FAT16 , FAT32 file system, maximum support 32G of the TF card, support 32G of U disk, 64M bytes NORFLASH A variety of control modes, I/O control mode, serial mode,?AD button?control mode
