Quantity   Component name
1 × ATTiny 85 small microcontroller
1 × push button It's a panasonic EVP-BFAC1A000,because they have a nice feeling
7 × Leds, in 0805 format. Matching the PCB color.
2 × Resistance array In 4x0603 format, to save room. 68Ohms
1 × capacitor for decoupling This one is a 0603, 100nF.
1 × CR1225 cell holder
1 × brooch pin
1 × CR1225 3V cell