BOYA BY-LM300 dual head lapel omni-directional electret condensor mic for recording crystal sound from 2 person at the same time. It can be used for DSLR camera, camcorder, PC & etc.Ideal for occasions such as interview, meeting, teaching & etc. 
Features: 
Omni-directional electret condensor microphone. 
Dual heads for recording voice from 2 person at the same time; Cable length about 4m/13ft, with 2pcs lapel clip. 
With low signal/noise ratio and wide frequency range. 
The windscreen can minimize environmental noise. 
3.5mm TRS connection, can be used for  DSLR camera, camcorder, PC & etc. 
Perfect for video making or sound recording, such as interview, song recording & etc. 
The BOYA BY-LM400 is a dual-lavalier microphone is designed for recording interviews. With 3.5mm(1/8") TRRS connector, it works for iPhone, Ipad and most of Android devices. Its omnidirectional condenser capsule captures the sound equally from all sides of the microphone. This design lends to effective, hands-free recording of speeches, interviews, dictations and more.
It uses a TRRS connector to connect into your smartphone or tablet's headphone input. With a 4m (13') Cable, the BOYA BY-LM300 can be used for presentations, podcasts, webcasts, or any situation where more than one subject needs to be recorded.
The package comes with mic clip and foam pop shield each two pieces and a carry pouch.
Features
Dual Omnidirectional Lavalier Mic
Works with iPhone, Ipad and most of Android devices
3.5mm(1/8") TRRS Connector
Excelllent for interviews
Improved Sensitivity & Signal-to-Noise
Plug and play
With 4m (13') Cable
Includes two pieces of Clips & Foam Windscreens
Also includes carry pouch
Package Content
1 x BOYA BY-LM300/BY-LM400 Lavalier microphone
2 x Lapel clip
2 x Foam windscreen
1 x Pouch
1 x Manual Book