Retractable digital ear buds; Bluetooth connectivity - controlled by walkers link app found in google play and app store; Rechargeable lithium battery; Hi-gain omnidirectional microphones for clear sound enhancement; Earbuds in improved position for less cord interference; HD Walker's in earbuds for wide range audio quality; Integrated micro USB port (Micro USB charging cable included); 4 frequency modes: Universal, Speech Clarity, Hi-Frequency and Power Boost; Independent volume control; 3 pairs of foam tips (S, M, L) included