To put simply, the RadioPi Zer0 is a USB A Addon Board V1.1 attached to a Raspberry Pi Zero W with the main purpose of radio transmission. This can be used as a music player, a small SOS beacon, etc.
This device can be plugged into any power supply with a USB port, be it a wall adapter, portable power supply, etc. All I/O ports are accessible, allowing for wired programming without disassembly.
There are many tutorials for programming the Raspberry Pi for radio transmission online
Due to it's compact design, along with being able to have a portable power supply, the RadioPi Zer0 is highly mobile and versatile.
Strip 4-5mm of insulation from a 12cm long 18 AWG wire. Solder the wire to gpio pin 7. Bend the antenna around the MicroSD card slot and pass it through the antenna port.
Raspberry Pi Zero W: https://www.adafruit.com/product/3400
USB A Addon Board: https://www.amazon.com/MakerFocus-Raspberry-Required-Provide-Connector/dp/B077W69CD1
MicroSD Card: https://www.amazon.com/Sandisk-Ultra-Micro-UHS-I-Adapter/dp/B073K14CVB/ref=sr_1_3?crid=1QTX1Y34ANTZT&keywords=16gb+micro+sd+card&qid=1558389825&s=gateway&sprefix=16GB+mi%2Caps%2C158&sr=8-3
18 AWG Wire: https://www.amazon.com/Ancor-Marine-Grade-Primary-Battery/dp/B000NUYGJI/ref=sr_1_7?crid=3CM2914Z3YPF5&keywords=18%2Bawg%2Bwire&qid=1558389936&s=gateway&sprefix=18AWG%2BWir%2Caps%2C157&sr=8-7&th=1
M2.5 x 12 Screws: https://www.amazon.com/uxcell-M2-5x12mm-Thread-Button-Socket/dp/B01AXUSWEM/ref=sr_1_5?keywords=m2.5+x+12&qid=1558389749&s=gateway&sr=8-5
Raspbian Stretch: https://www.raspberrypi.org/downloads/raspbian/
PiFM: git clone https://github.com/rm-hull/pifm
MPG123: sudo apt-get install mpg123