Quantity   Component name
1 × KeyDuino https://www.elecrow.com/keyduino-p-1620.html
1 × DC connector http://www.aliexpress.com/item/Free-Shipping5-5mm-x-2-1mm-DC-Charger-Jack-Socket-Female-Panel-Mount-Connector-Adapter-Copper/32237173613.html
1 × box (not in metal)
1 × servomotor http://www.aliexpress.com/item/Tower-Pro-9g-micro-servo-for-airplane-aeroplane-6CH-rc-helcopter-kds-esky-align-helicopter-sg90/1579234971.html
1 × led push button http://www.aliexpress.com/item/250VAC-2A-DC-5V-Blue-LED-Light-SPST-Momentary-Type-Pushbutton-Switch/32434384285.html
1 × 9v battery connector http://www.aliexpress.com/item/IMC-Hot-50-Pieces-2-Wire-Terminals-9V-Batteries-Clip-Connectors-Holder-Black-Red/32438940581.html?ws_ab_test=searchweb201556_1_79_78_77_80,searchweb201644_5,searchweb201560_9
1 × 9v battery