[Advanced Bluetooth 5.0 Technologies]: Your USB audio transmitter is backward compatible with Bluetooth 4.2/4.0/3.0 and it can deliver more stable wireless to your devices. USB audio adapter can conveniently enhance your non Bluetooth devices with Bluetooth audio feature. | [Support Multi-device Connection]:Realize the connection between the computer and other Bluetooth-enabled devices, such as mobile phones, tablets, mice, keyboards, bluetooth headsets, bluetooth speaker, gamepads, printers, etc. | [Multi Application]: Connect with Bluetooth headphones, speakers or receivers for wireless stereo music streaming. Also for Skype calls, Google Hangouts and mobile phone/tablet data transfer. | [Esay to Use]: If not installing the driver, it can support the transfer of mobile phone tablet files and photos. Install the full version of the driver, the computer can be connected to Bluetooth headset and stereo.. | [Please Note]: It is not compatible with iOS, Android, iPad OS. If you have any questions or suggestions about our products and services, please feel free to contact us.

Blue tooth 5.0: The latest Blue tooth 5.0 chip is used to ensure instant pairing, and the transmission signal is faster and more stable. High-fidelity chip, 10-meter barrier-free signal transmission range is wider | Support Multiple Functions: Blue tooth adapter supports blue tooth receive and transmitter, TF card playback, navigation calls. ①TX mode: Transmit the audio of non-Blue tooth audio source devices to the Blue tooth headset/speaker via a 3.5mm audio cable. ② RX mode: Transmit the audio of the Blue tooth audio source device to the non-Blue tooth headset/speaker/car/home audio system through the 3.5mm audio cable | Good Sound Quality And Low Latency: The mini Blue tooth adapter uses a low latency encoder to provide high-quality audio and bring you an excellent sound quality experience. Note: Blue tooth headsets/speakers are also required to support low-latency technology | USB Charging, Lithium Battery Power Supply: the built-in battery can support a full charge of the Blue tooth adapter to use for 4--5 hours. When in a low battery state, the adapter can be plugged into the power supply for charging while working | Wide Application Range: Usb blue tooth 5.0 adapter can be used for almost all devices with 3.5mm auxiliary audio input/output. Can be connected to non-Blue tooth devices, such as cars, home audios, projectors, TVs, PCs, old-fashioned amplifiers, etc., and compatible with most Blue tooth devices, such as mobile phones, earphones, etc., without installing any external drivers

1.54inch e-Paper Module Wiki: www.waveshare.com/wiki/1.54inch_e-Paper_Module_(C) Instructions video: www.youtube.com/watch?v=o2UK_lhnObw Video: https://www.youtube.com/watch?v=o2UK_lhnObw | Don't accept partial refresh. This is an E-Ink display module, 1.54inch, 152x152 resolution, with embedded controller, communicating via SPI interface, supports yellow, black, and white three-color display. Due to the advantages like ultra low power consumption, wide viewing angle, clear display without electricity, it is an ideal choice for applications such as shelf label, industrial instrument, and so on. | SPI interface, for connecting with controller boards like Raspberry Pi/Nucleo, etc; No backlight, keeps displaying last content for a long time even when power down; Ultra low power consumption, basically power is only required for refreshing. | Operating voltage: 3.3V, Interface: 3-wire SPI, 4-wire SPI; Resolution: 152 152, Dot pitch: 0.181 0.181, Grey level: 2, Full refresh time: 27s, Refresh power: 26.4mW(typ.), Standby power: 170 | Interface Description: VCC:3.3V, GND: Ground, DIN: SPI MOSI pin, CLK: SPI SCK pin, CS: SPI chip selection, low active, DC: Data/Command selection(high for data, low for command), RST: External reset, low active, BUSY: Busy status output, low active.