How to distinguish the hammer is a dual purpose, that the use of dual sign.
The dual-purpose charged shovel, shovel will not turn, can only play group, most willing to use the line tick wall, above a knob, the hammer is a special drill
More than two electric hammer with multiple functions, there are three to four functions. Resolution mainly depends on shell without the function selection button, single function only hammer handle switch. There is no function selector knob. Here's a picture comparison: a versatile one
