Normal operating range: -20°C to 40°C
Extended operating range: -40 to 60°C 
Sensor Inputs: 5 standard; option to expand to 10
Smart Sensor Compatibility: Compatible with most Onset smart sensors, except for the S-BPA, S-TMA and S-THA
Data Channels: Maximum of 15 (some sensors use more than one data channel)
Alarm Output Relay: Can be configured to be activated, deactivated or pulsed on user-defined sensor alarms. The relay can be configured as normally open or normally closed, and is rated for 30 V and 1 amp max.
Expansion Slot: One expansion slot is available for factory-installed expansion port.
Local Communication: Full Speed USB via USB mini-B connector
Size: 17.8 H x 11.7 D x 19.3 W cm
Weight: 2 kg
Materials: Outer Enclosure: ABS blend with stainless steel hinge pins and bronze inserts; Inner Enclosure: Polycarbonate with bronze inserts; U-Bolts: Steel with zinc dichromate finish; Gaskets: Silicone rubber; Cable entry channel: EPDM rubber ; Cable entry bars: Aluminum with ABS plastic thumb screws
Data Storage Memory: Nonvolatile flash data storage, 512K bytes local storage
Memory Modes: Stop when full, wrap around when full
Operational Indicators: Up to six (depending upon options) status lights provide basic diagnostics
Logging Interval: 1 second to 18 hours, user-specified interval
Battery Type: 4 Volt, 4.5 AHr or 10 AHr, Rechargeable sealed lead-acid
Rechargeable Battery Service Life: Typical 3–5 years depending upon conditions of use. Operation within the extended operating range (but outside the normal range) will reduce battery service life.
Time Accuracy: 0 to 2 seconds for the first data point and ±5 seconds per week at 25°C
Environmental Rating: Weatherproof enclosure, tested to NEMA 6. (Requires proper installation of cable channel system)
Mounting: 3.8 cm mast or wall mount
Enclosure Access: Hinged door secured by two latches with eyelets for securing with user-supplied padlocks
Sensor Network Cable Length: 100 m maximum
External Power: External power is required. The system optionally accepts the following Onset solar panels: SOLAR-1.2W, SOLAR-3W, SOLAR-6W; Alternatively it accepts an AC power adapter: AC-U30

Optional Analog Sensor Port Specifications
Input Channels: Two, single-ended
Field Wiring: Two- or three-wire via screw terminals on detachable connector, 16–24 AWG.
Input Range: User-configurable: 0–20 mA DC, 0-2.5 VDC, 0-5 VDC, 0-10 VDC, or 0–20 VDC
Minimum / Maximum Input Voltage: 0 / 24 VDC
Minimum / Maximum Input Current: 0 / 24 mA DC
Minimum Current Source Impedance: > 20 KΩ
Accuracy: ± 0.25% of FSR from 50mV to FSV
ADC Resolution: 12 bits
Excitation Power: Switched 12 VDC, up to 50 mA; user-selectable warm-up from 5msec to 2 minutes