This section of induction heating using low-voltage DC power supply 12-48V. Maximum current 20A, maximum power 1000W. Tested 53V power supply when working properly. Because of its moderate power, can be used for small parts DIY players do hardening, annealing and other heat treatment. Also can be used with a graphite crucible melting gold, silver, copper, aluminum and other metals, uniform heating fast, very convenient. Inside diameter of the coil: approx. 40mm. Height of the coil: approx. 50mm. 24V input with no load current of 3A. 48V input with no load current of 6A. The higher the voltage, the greater the heating current when the same thing, the effect is better. But at the same time heat is also large, so to eradicate the actual situation to select the input voltage, the general use of the words 24V or 36V power supply is enough. It suits 12-36V power supply (not included). Item type: tool The coil accept 40mm crucible. Colour:black Material:metal Package Contents: 2 x 1000W ZVS Heating Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.