This timer replaces OEM timers in Schumacher, Century, and other popular chargers. Easily installs with 4mm screws (included) through the charger panel and into the mounting plate on the timer. The screws are covered by the sturdy press-fit skirted knob. Wire terminals use .250" industry-standard solderless push-on connectors. No AC power is required to run timer. No specialty tools required. When oriented with the "OFF" position at 12 o'clock, timer has a "HOLD" position (constant ON) when rotated counterclockwise to the 11 o'clock position. Otherwise, when rotated clockwise to a set position, it will countdown back to the OFF position at 12 o'clock. A finish bell alerts you to the timer returning to the OFF position.>>>Replaces: Schumacher Timer 0099000094, 0099-000094, 2299001548, 2299-001548 Snap-On Timer 2-14866 Century/Solar Timer 246-457-666, 246-515-666 Goodall Timer 51-245, 51-246, 51-248, 246-337-000, 246-167-000, 246-167-666>>>Note: Some of these OEM timers were 135 minute duration, which are no longer available. The 120 minute timer is now the standard replacement. A 120 minute timer dial label is included for your convenience.>>>Special Mounting Note: Battery charger manufacturers have used versions of this timer that mounted with either M3 (3mm) or M4 (4mm) screws. This timer uses the larger M4 screws, which are supplied in the kit. If you are replacing a timer that used the smaller M3 screws, it will be necessary to increase the size of the mounting holes in the charger cabinet. You can enlarge the holes with a small drill bit. 4mm, 5/32”, or 3/16” bits will all work.>>>Specifications .250" Push-on connectors. Switched Current Rating 13A/120VAC, 16A/250VAC Timer body - 1.71"H x 1.85"W x 1.04"D Stem - .70"L x 6MM (.236") Diameter Contents 120 minute timer with "HOLD" position. Skirted press-fit knob with steel retainer insert. Mounting fasteners & hardware. Laminated 120 minute Dial Label. Instruction sheet.