Devices such as LightStream Pocket, AirStash, Library Box, Pirate Box or Raspberry Pi allow transfer of files through a local wifi network.
Lightstream Pocket - Can share content via wi-fi, bluetooth or by writing content to MicroSD cards. This device is available from Renew World Outreach.
MicroPi is a DIY solution based on the Raspberry Pi Zero W. The MicroPi is a low-cost, low-power, high-capacity (depending on size of MicroSD card purchased) device. Also offers ‘Kiosk Mode"‘ where the device can display content directly to a connected display. You can learn more about the MicroPi by reading the IMN Review or by visiting the MicroPi website.
ConnectBox is a DIY self-contained, self-powered, WiFi based portable media distribution system. It allows users to create a full featured ‘digital library’ from which media (text, video, audio, applications) can be shared on mobile phones, tablets, laptops, desktops in an off-the-grid environment without depending on access to the internet or electricity.
Basic Information about which Digital System to Choose
Will it be an ‘Audio Bible’ only (where all the content is Scripture), or do I want to put other audio onto it like songs, drama, sermons, etc.?
Will the audio product be for small groups? Individual use? Or will it be used in communities where a significant group of people will want to gather round to listen and discuss (often the case in oral cultures)? Check the speaker output of your unit to assure you have either the power or the means to connect with auxiliary speakers.
Is the ability to charge by solar power important? Would people be happy charging by hand-crank? Are 12V car batteries available? There are some very creative and efficient solar charging systems available which can be utilized, not only for digital player charging, but for other uses in the community as well. It may be worth it to invest in one.
You may be in a context where people have access to computers and might want to replace Scripture content by their own music. Consider finding ways to distribute which locks data. Currently it is not easy to lock an SD card. Some audio recorders like Megavoice have data locking features.
Cost & Repair
Consider shipping costs, import taxes, and any necessary accessories like solar panels, SD cards and chargers. Repair may be difficult for certain types of audio devices. Cell phones are cheaper to acquire and repair but data is less secure.