Wireless Sensor 2 Battery Banks, Voltage & Current2 battery banks voltage & current *Requires 0-50 mV shunt. One per battery.Specifications:Status LEDs: Blinking green — Power ON / Intermittent blue sensor — Sending dataOperating Voltage: 9 – 30 VdcRange: Up to 300 ftPower Consumption: 11 mA @ 12 VdcBattery (Back Up) — Optional: 1,100 mAh / Lithium Thionyl ChlorideBattery Backup Time: Up to 100 hrsWireless Frequency: 900 MHzEnclosure: IP-66 Rated ABS PlasticOperational Temperature: -22°F – 167°F / -30°C – 75°CHumidity: 95% R.H. @ 122°F / 50°C non condensingCompact Size: 4 in x 2.75 in x 1.6 in / 102 mm x 70 mm x 40 mmLight Weight: 5 oz / 141 gramsCertifications: FCC, CE