Compatible Devices- Deep Freezer upto 4 Amps, Refrigerator upto 600 Ltrs Maximum Spike Current- 4 A High voltage cut-off Protection.Fail Safe Circuit Protection Other Performance Features- 2 - 4 mts Constant Time Delay The unit will pass the current after 2 to 4 mins delay after plugging ( Extra safety for your appliance).The product comes with 16 amp plug only (Power point connection, not suitable for 6 amp socket). Other Power Features: 135 - 280 V Working Range (I / P)