Sensor Details
Range: 0 to 255 counts/interval
Maximum Frequency: 50 counts/sec
'Divide by' Counter: 1 to 255
Input Type: Digital or volt free contact. For counting bats this would typically be a specialist bat count unit (not included)
Max. Error: +/- divisor/2
Digital:
Low Level: -0.5V to 1V
High Level: 2.5V to 10V
Min Pulse Width: 150us (at 5V)
Min. Pulse Separation: 150us (at 5V)
Edge Detection: High-low transition
Contact:
Type: Normally open (with minimal debounce)
Min Closed Time: 150us
Min Open Time: 500us
Edge Detection: Open to closed

Features
Memory Size: 16k (non-volatile)
No. of Readings: 16000 (approx.)
Resolution: 8 bit
Trigger Start: Magnetic reed switch
Delayed Start: Relative / Actual up to 45 days
Stop Options: When full, after n readings, never (wrap around)
Reading Types: Actual, Min, Max
Logging Interval: 1 sec to 10 days
Offload: While stopped or when logging in minute multiples
Alarms: Two, fully programmable
Functional Range: -40°C to 85°C / -40°F to 185°F
IP Rating: IP68 waterproof
Battery Life: Up to 5 years (battery replacement recommended every 2 years)

Mechanical Details
Case Style: IP68 style
Weight: 110g
Dimensions of Case: 34 x 59 x 80mm