Allows you to activate the ZELLO push-to-talk function wirelessly (Apple IOS devices only). AUTOMATICALLY pairs quickly and easily (after selection in Zello device settings) Remembers the paired connection even if you have to replace the battery. Operates for up to 2 years on a single, easy to change CR2032 coin cell battery. Can be held in the hand or attached to almost anything using the included adjustable Velcro strap! NO CHARGER NEEDED! Simply unscrew the case to easily change the CR2032 coin cell. Includes 1 CR2032 coin cell battery. So easy to use! NO POWER SWITCH. NO LIGHT. NO PAIRING BUTTON. Just install the battery, open the Zello application, find the PTT in the device settings, select and your ready to go!.