Dear Sir/Madam, System Capacity:250 devices/loop *Max. networking 32 Loops and total 8000 points Power:220V AC 50/60Hz * Others also available Battery Capacity:24V DC 4Ah Charging Voltage (Current):26V DC 100~1000mA *With auto adjustment function Zone Voltage (Current):26.5V DC 340mA Exterior Resistance:Round-trip under 40 ohm Transmitting Method:Digital series transmitting Accumulation Time/Main Sound:0~40 seconds/ 85dB@1M Material / Color:1.6 mm steel plate / Pearl gray Dimensions (mm) H x W x D:1-4 Loop: 400 X 500 X 130 / 5-8 Loop: 600 X 500 X 150 Show More