Spy-MAX iStranger Voice Changer for all Cell & Smartphones Professional Cell Phone Voice Changer - Portable/ Compact- High and Low Mode- Built-in Microphone  Heavy Duty- Battery Operated Handheld Electronic Device - Works with All Mobile Phones (Black) 2 VOICE CHANGING MODES: The iStranger digital voice changer allows you to choose between a high and low pitch mode, creating a realistic, disguised, perfectly-audible voice. CARRY IT ANYWHERE: The battery powered anonymous voice changer is lightweight and compact to allow for easy portability and maximum discretion. WORKS WITH ANY PHONE: The microphone voice changer device quickly attaches to any smartphone or cell phone by connection via the headphone jack. EASY TO USE: Simply hold the mini multi voice changer to your ear like a receiver and speak Naturally, Clearly and Slowly! It is equipped with a USB-rechargeable battery that lasts up to 6 hours.