You might call this a PocketCHIP love letter.

Parts:

• Teensy Thumb Keyboard PCB
  https://hackaday.io/project/162281-teensy-thumb-keyboard
  https://github.com/AnthonyDiGirolamo/teensy-thumb-keyboard
• Teensy 3.2 - $19.80
  https://www.pjrc.com/store/teensy32.html
  https://www.adafruit.com/product/2756
• HyperPixel 4.0 - $49.95
  https://shop.pimoroni.com/products/hyperpixel-4?variant=12569485443155
  https://www.adafruit.com/product/3578
• PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C - $19.95
  https://shop.pimoroni.com/products/powerboost-1000-charger-rechargeable-5v-lipo-usb-boost-1a-1000c
  https://www.adafruit.com/product/2465
• Lithium Ion Polymer Battery - 3.7v 2500mAh - $14.95
  https://www.adafruit.com/product/328
• Slide Switch - $0.95
  https://shop.pimoroni.com/products/spdt-mini-power-switch
  https://www.adafruit.com/product/805
• Raspberry Pi 3 - Model B+ - 1.4GHz Cortex-A53 with 1GB RAM -$35
  https://www.adafruit.com/product/3775
  https://shop.pimoroni.com/products/raspberry-pi-3-b-plus
• SD Card - $6.99
  https://www.amazon.com/Samsung-MicroSD-Adapter-MB-ME32GA-AM/dp/B06XWN9Q99
• Panasonic EVQ-PAC04M Tacticle Switche
  https://www.mouser.com/ProductDetail/667-EVQ-PAC04M
  https://www.digikey.com/products/en?keywords=EVQ-PAC04M
  60x $0.0177ea
• 1n4148 Zener Diodes 
  https://www.amazon.com/gp/product/B06XB1R2NK