The Lifeproof Battery Detail Trimmer is the perfect washable ear and nose trimmer for hygienic grooming. This trimmer is battery powered for cordless use and a battery is included in the kit. What is unique about this detail trimmer is the shock-proof rubber housing. It not only provides a comfortable no-slip grip for a secure hold, it also provides a protective outer layer to the trimmer body to prevent it from breaking if accidentally dropped. It's also super easy to use. Simply twist the upper half of the trimmer to turn it on and twist it in the opposite direction to turn off.