Hoist Block II ™ (HB2) is a hoist load limit controller used with either an ISI® Rope Load Cell or the ISI® Load pin (custom). only 11.04 x 9.04 x 9.72 inches, 115VAC/230VAC powered (other available, including 230 vdc or vac etc. NEMA 4X IP68 Polycarbonate with 2 form C relays for HIGH load (UP direction) and LOW load trips (Low can be used for Slack Rope - DOWN direction). The device can be placed on the hoist itself or where easily viewed. The dome on the top is a red/green visual indicator with audible alarm. A large SCOREBOARD (ISI® part # Display56) can be added as an option to read the load on the hoist. Additionally MULTIPLE HOIST LOAD SUMMING OPTION IS ALSO AVAILABLE with possibility of display for the SUM and each individual hoist. CUSTOM hardware/software for position overload variations are also available(email us). FOR hoists with "dead end" please give number of falls of rope, rope diameter and the full tons of the hoist. For other hoists please email or send approximate load pin diameter and length you require for initial quotation. Nicely accurate and the audible and visual alarms make it very user friendly.