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Instructions for use：
1.Pull out the Transparent Insulating Film simply pushing the control button makes the light switch ON/FLASH/OFF, Collar has 4 different options controlled with a switch on the collar: Solid Light, Fast Blink, Slow Blink, and Off.
2.Collar is Silicone waterproof. This means that it is fine in the rain and suitable for swimming.
3.Batteries last 60-80 hours and can be changed,the kinds of battery is 2pcs CR2016batteries.
S: Width 2.5CM(0.98Inch) length 35~43CM(13.8~16.9Inch)
M: Width 2.5CM(0.98Inch) length 40~48CM(15.7~18.9Inch)
L: Width 2.5CM(0.98Inch) length 45~52CM(17.7~20.5Inch)
XL:Width 2.5CM(0.98Inch) length 52~60CM(20.5~23.6Inch)