Product features: 6 double step pushbuttons + EMERGENCY STOP+SPARE KEYS+SPARE; With battery voltage warning device, the power is cut off during low power.Safety key switch to prevent from unauthorized user; Durable nylon-fiber housing for extra shock resistance; Up/down, east/west, north/south can be set as to mutual inhibition or not. Power key can be set to start, acceleration, toggle switch, general or other functions; Spare No.1 to NO.6 keys can be set to general, interlocking, toggle switch, on/off or other functions through computer. Specifications: Transmitter size:156*61*51 mm, Weight: 255g;Receiver size: 210*162*107 mm, Weight: 1220g Double speed buttons; Safety code: 32 bits(4.3 billions group); Temperature range: -40°C~+85°C; Enclosure protection class: IP 65; Transmitter power: 3V DC(2 AA batteries last up to 4 months); Receiver power: 18~65V AC/ DC,or 65~440V AC/DC (optional); Output contact capacity: 8A sealed relay output(AC 250V/10A relays,10A fuse contacts); Structure: Glass-Fiber PA; Industrial crane 6-channel wireless remote control switch; Control distance:100 meters; CE/FCC/ISO9001 certificates.Package included: one transmitter (with hanging belt); one dust bag; one receiver; receiver is with 2 meter cable; operation and maintenance manual.