Specifications:

All the models:
★ Max input power : 7KW,
★ Max input current : 32A,
★ Output Oscillation Frequency : 30-100KHZ
★ Input voltage : Single-phase 220V, 50 or 60 HZ
★ MOSFET Power device
★ Duty cycle : 80%
★ water cooling desire: 0.2Mpa, 5 L/min

What are the differences of them?

Model No.	Type	Timer Function	Output Transformer	Heating/ Retaining	Transformer cable length	Dimension (W) X (H) X (L) cm	Weight
SP-15	Normal	NO	Built-in			44 X 27 X 39	18kg
SP-15A	Auto-control	YES	Separated	1-99 seconds		46 X 20 X 44	20kg
SP-15B	Split	NO	Built-in		2 meters	Main unit:  46 X 20 X 44  Transformer:  31 X 19 X 33	Main unit: 14kg Transformer: 11kg
SP-15AB	Auto-control/Split	YES	Separated	1-99 seconds	2 meters

Key Features:
 1. Adopt the MOSFET power devices and the first generation of current-converting control technology,
     output oscillation frequency is 30-100KHz;
 2. Super portable,light weight.
 3. Simple operation. 
 4. Easy to install,connecting power and cooling water can be done in several mintues, can save costs for
     customer without expert installing.
 5. The power and time of heating and retaining are adjustable to improve quality and simplify operation.