When you need more private conversation or are in an environment where a speaker maybe inconvenient quickly and easily connect the earphone accessory. The in-line microphone button option allows you to transmit with the quick access near your lapel.
When you need more battery life try the powerful 5000mAh extended battery with 30+ hours of standby. Fit for extended outdoor use when charging might not be easily available. Charging via USB port allows for flexible recharge options.