Two solderless breadboards (MS MKKN2, AF 64, DK 438-1045-ND, SFE PRT-09567)

Hookup wire or jumper wire kit (MS MKSEEED3, AF 153, DK 923351-ND, SFE PRT-00124)

Two Arduino boards (MS MKSP4, SFE DEV-09950, AF 50)

USB A-to-B cable for Arduinos (AF 62, DK 88732-9002, SFE CAB-00512)

An LED (try the 5 mm size, and make sure you don’t buy any surface mount (SMT) parts) (DK 160-1707-ND, RS 276-041, SFE COM-09590)

One 10K ohm resistor (DK P10KBACT-ND, SFE COM-08374)

One momentary switch for input (DK EG2025-ND, RS 275-618, SFE COM-09179)

One buzzer for output (DK 102-1621-ND, RS 273-060)

One XBee radio (Series 2/ZB firmware) configured as a ZigBee Coordinator AT mode (Digi: XB24-Z7WIT-004, DK 602-1098-ND)