Seismometer	Mark Products L-28 4.5 Hz vertical-component seismometer mounted in separate pressure case. Gimbals will level seismometer if tilt <40°.
Pressure Sensor	HiTech crystal hydrophone with low-frequency corner at 5 Hz.
Digitizer	Quanterra QA330 24-bit A/D. Dynamic range: 135 dB. Data compression. Sample rates: 1-200 Hz.
Clock	Seascan PrecisionTimebase. Drift rate is 3-5 x 10-8 (<0.5 ms drift a day before correction).
Disk Capacity	9 GByte Hard disk
Data Offload	Glass ball need not be opened. Transfer rates of at least 1 MByte/s .
Battery Pack	Batteries are stored in separate 12" glass ball.
Recording Duration.	Alkaline battery pack will deliver sufficient power for 60 days. Lithium battery pack will allow 6 month operation.
Weight	160/110 lbs with/without anchor
Pressure Case	17" and 12" glass ball
Release	Single burnwire operated acoustically
Dimensions	44" high x 22" wide
Power	1 W for 2 channels at 200 samples/sec and duty-cycled disk