1. 3 phase 3 line and 3 phase 4 line optional. 3.Optional functions: > transmitting output or switch module: 4 loops 4-20ma or 0-20ma; 4di/do > digital cummunication: rs-485 modbus-rtu > electric energy pulse: 2 loops electric energy pulse output Packing size: 30*25*30cm 0.0225m3 Qty: 18pcs per pack Edit