5
5. Do not short the battery cartridge:
(1) Do not touch the terminals with any 
conductive material.
(2) Avoid storing battery cartridge in a container 
with other metal objects such as nails, coins, 
etc.
(3) Do not expose battery cartridge to water or 
rain.
A battery short can cause a large current flow, 
overheating, possible burns and even a 
breakdown.
6. Do not store the tool and battery cartridge in 
locations where the temperature may reach or 
exceed 50 °C (122 °F).
7. Do not incinerate the battery cartridge even if it is 
severely damaged or is completely worn out. The 
battery cartridge can explode in a fire.
8. Be careful not to drop or strike battery.
9. Do not use dropped or struck battery.
SAVE THESE INSTRUCTIONS.
Tips for maintaining maximum battery life
1. Charge the battery cartridge before completely 
discharged.
Always stop tool operation and charge the battery 
cartridge when you notice less tool power.
2. Never recharge a fully charged battery cartridge.
Overcharging shortens the battery service life.
3. Charge the battery cartridge with room 
temperature at 10 °C - 40 °C (50 °F - 104 °F). Let a 
hot battery cartridge cool down before charging it.
FUNCTIONAL DESCRIPTION 
CAUTION: 
• Always be sure that the tool is switched off and the 
battery cartridge is removed before adjusting or 
checking function on the tool. 
Installing or removing battery cartridge 
(Fig. 1)
• Always switch off the tool before insertion or removal of 
the battery cartridge. 
• To remove the battery cartridge, withdraw it from the 
tool while pressing the buttons on both sides of the 
cartridge. 
• To insert the battery cartridge, hold it so that the battery 
cartridge front shape fits to that of the battery 
installment opening and slip it into place. 
Always insert it all the way until it locks in place with a 
little click. If not, it may accidentally fall out of the tool, 
causing injury to you or someone around you.
• Do not use force when inserting the battery cartridge. If 
the cartridge does not slide in easily, it is not being 
inserted correctly. 
Switch action (Fig. 2)
CAUTION: 
• Before inserting the battery cartridge into the tool, 
always check to see that the switch trigger actuates 
properly and returns to the “OFF” position when 
released. 
To start the tool, simply pull the switch trigger. Tool speed 
is increased by increasing pressure on the switch trigger. 
Release the switch trigger to stop.
Turning on the front lamp (Fig. 3)
CAUTION: 
• Do not look in the light or see the source of the light 
directly. 
Pull the switch trigger to turn on the light. The lamp keeps 
on lighting while the switch trigger is being pulled. The 
lamp turns off 10 -15 seconds after releasing the trigger. 
NOTE: 
• Use a dry cloth to wipe the dirt off the lens of lamp. 
Be careful not to scratch the lens of lamp, or it may 
lower the illumination. 
Reversing switch action (Fig. 4)
This tool has a reversing switch to change the direction of 
rotation. Depress the reversing switch lever from the A 
side for clockwise rotation or from the B side for 
counterclockwise rotation. 
When the reversing switch lever is in the neutral position, 
the switch trigger cannot be pulled.
CAUTION: 
• Always check the direction of rotation before operation. 
• Use the reversing switch only after the tool comes to a 
complete stop. Changing the direction of rotation 
before the tool stops may damage the tool. 
• When not operating the tool, always set the reversing 
switch lever to the neutral position. 
Speed change (Fig. 5)
To change the speed, first switch off the tool and then 
slide the speed change lever to the “2” side for high speed 
or “1” side for low speed. Be sure that the speed change 
lever is set to the correct position before operation. Use 
the right speed for your job. 
CAUTION: 
• Always set the speed change lever fully to the correct 
position. If you operate the tool with the speed change 
lever positioned halfway between the “1” side and “2” 
side, the tool may be damaged. 
• Do not use the speed change lever while the tool is 
running. The tool may be damaged. 
Adjusting the fastening torque (Fig. 6)
The fastening torque can be adjusted in 18 steps by 
turning the adjusting ring so that its graduations are 
aligned with the pointer on the tool body. The fastening 
torque is minimum when the number 1 is aligned with the 
pointer, and maximum when the marking is aligned with 
the pointer. 
The clutch will slip at various torque levels when set at the 
number 1 to 18. The clutch is designed not to slip at the 
marking. 
Before actual operation, drive a trial screw into your 
material or a piece of duplicate material to determine 
which torque level is required for a particular application.