Grounded 120V 6oHz Analog (mechanical) timer with non-removable on-off pins for up to 48 on-off cycles per 24-hr period. Great replacement timer. This timer has been tested, keeps time and works fine but has a slight humming sound that may not be important to you. Most mechanical timers emit some slight buzzing sound which may be more noticeable in some than others. This AS-IS pricing includes shipping and is NON-EXCHANGE/RETURNABLE/REFUNDABLE.