Usage Tips:Features: brand and The receiver for smartphone, ,DSLR Camera and PC. Wireless lapel microphones can be used for course teaching,recording,live streaming,dffice meeting,conference,vocal,interview,vlog,, etc. Comes with 1pc 6.35mm/0.25in round headphone plug. Operating range is up to 164 feet and the signal transfer more stable. LED screen will show you battery volume,frequency,adjust display. Specifications: Operating Range: up to 164 feet (50 meters accessibility) Charging Mode: USB Charging Battery Capacity:400 mAh Material:ABS Optional Type:Head-mounted :Lavalier Size:4.5x3.5cm/1.77x1.37in Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: Package A:(A/B Optional) 1XTransmitter 1XReceiver; 1XCharging Cable; 1X6.35mm/0.25in Plug 1XUser Manual Package B: 1XTransmitter 1XReceiver; 1XCharging Cable; 1X3.5mm/0.14in (4 to 3)Adapter 1xClip 1XUser Manual