While the two rectangular rings at the top of the trap stop the two halves closing completely

The PERDIX integrated antenna VHF transmitter boards have been designed so that a range of coin cells can be easily attached

allows it to be used in most environments

In addition to illumination flexibility

2) a trigger mechanism that can be activated via one of two actions  (Trigger) and 3) an arrangement of six high-strength impact bars (Strike bar)

Dipole Antenna for Camera Traps IQ312 While the two rectangular ringsThis handy and lightweight dipole antenna is ideal for improving the signal strength to mobile enabled (cellular) camera traps. With a 3m cable, the antenna can be positioned away from the camera where a stronger signal is available. The antenna has a moulded bracket to allow it to be easily attached to various surfaces. Works on all networks for 2G, 3G and 4G. SMA male connector.