Plastic Gear Package - 75 Kinds
1 × ₦ 6,750 
USB to RS-485 Converter
1 × ₦ 3,000 
5V 30A Single Channel Relay
1 × ₦ 2,500 
Arduino Uno R3 Surface Mount Version SMD
2 × ₦ 10,000 Subtotal: ₦ 32,250