Processor: AT tiny 12L-4sc: 8-pin surface mount/ 4MHz/ in-system programmable --- $1.46

Receiver: RXM-433-LC-S-ND Surface mount 433MHz receiver --- $9.85

Speaker: P9902 TR-ND: 8.5mm x 8.5mm/ 92dB/ surface mount/ 2.5KHzà 2.7KHz range --- $2.234

Custom-made Casing: Estimated at $1.50

Antenna: part of board.

Battery: P189-ND Panasonic CR2032: 3V/ 220mAh/ 20mm --- $0.21675

Battery Holder: BA2032 SM-Bulk-ND: Surface mount coin 20mm battery holder --- $0.35

Audible Alert Off Button: P8006S Momentary switch --- $0.099

PCB: $.65 / sq in. = 1 x 1 in. = $0.65

Processor: ATMEL AT 90S1200-4YC --- $2.05

LCD: Vacuum fluorescent display/ 2x20 lines --- $4.95

Keypad: $2.00

Custom-made Casing: Estimated at: $2.5 - $3

Transmitter: TXM-433-LC-ND surface mount 433MHz transmitter --- $4.90

Power Supply: Diamond 35-6-500D: 6V/ 500mA --- $1.53/per unit

Antenna: $1

PCB 2 x 2 in * $0.65 = $2.60

Total cost of package: $96.64 (with 4 remote units)