Pendant that uses in switching operation and maintenance operation, the characteristic is: including guardian's end and operation personnel end, specific, guardian's hand ladle is drawn together the guardian and is held control and processing unit, guardian to hold the switch element, and the guardian holds the wireless transmission unit, and the guardian holds the guardianship and reports an emergency and asks for help or increased vigilance the unit, operation personnel hand ladle is drawn together the operation personnel and is held control and processing unit, operation personnel to hold the switch element, and the operation personnel hold the wireless transmission unit, and the operation personnel hold the guardianship and report an emergency and ask for help or increased vigilance the unit. The utility model discloses having and can timely warning guardian and operation personnel possibly surpassing equitable guardianship distance, make guardian and the operation personnel work supervisory institution's that reaffirms whether the guardianship method accords with in " electric power safety work rules " requirement, the potential safety hazard of bringing not in place is guarded in the effectual reduction of ability because of working. The utility model overcomes existing tools can't indicate guardian and operation personnel probably to exceed and rationally guard the not enough of distance.