Support AUX audio and microphone input at the same time; connect your external devices with AUX cable(not included); such as tablet; smartphone; MP3; you can add background music when speaking. Longer transmission distance; working range up to 100m/328ft in open area; receivers do not have to be clustered around the transmitter; useful information can be heard clearly. Long use time; the battery capacity of the assisted listening devices transmitter is 4200mAh; the receiver battery is 900mAh; working time is 20h; which can meet the long-term use of a single time. Simple operation; wireless tour guide system is designed to be easy to use; turn off all receivers with one key; without complicated operations; suitable for large-scale occasions such as tour guides and conference translations. Upgrade tour guide system; D-shaped headphone accessories; universal headphone for left and right ears; relieve the pain of wearing one ear for a long time; meet the needs of the disabled.