Power Probe II deluxe model When you connect your Power Probe II to the car battery you will have a multitude of testers at your finger tips. With the press of a switch you'll have an instant hot lead or ground lead. Use the hot and ground lead simultaneously to activate componenets right in your hand. Instantly check components for continuity as well as identify positive, negative and open circuits without re-polarizing hook-up clips. Follow and locate shorts without wasting fuses. The 19ft lead will allow you to test bumper to bumper without jumper leads. All that plus these great features! • New louder ,easier to hear audio signal. • Audio tone indicates positives by a higher pitched tone and negative by a lower pitched tone. • Now you're able to turn the audio feature on and off. Great when testing relays! • The Power Probe II now has 2 bright white headlights instead of one. • The new headlights are long life LEDS assurring years of replacement free service. • The housing is now sleeker and feels more comfortable in the hand.