6pcs Deer Whistles For Car, Car Animal Warning Whistle With Alarm Deer Band Horn Upgrade Design: These deer whistles have been upgraded, compared to single hole whistles. Two holes can widen the voice gate, which can keep animals off the road more effectively. Function: These security alert devices use the wind to produce an ultrasonic wave which is harmless to animals but can chase animals from your car for 1/4 mile, harmless to your driving and your animals. High Quality: These deer whistles are made of premium ABS plastic material which is strong, reusable and durable. It can withstand all kinds of extreme weather conditions, and the tape is waterproof, it won't fail easily. Easy to install: Each warning whistle is attached with self-adhesive tape, you just need to remove the paper and stick the whistle on the car. Please make sure the side with 2 holes is facing out. Package includes: This set of deer whistles includes 6 pieces of deer alarm whistles, 2 are transparent, 4 are black. Two kinds of colors can meet your different preferences and needs to match your car.(SZMG)