4-channel PPM single conversion receiver on 75mhz, PERFECT for pairing up with the VEX radio transmitter. 
 
Comes in a protective case, which can be removed to further reduce the footprint of the unit. 
 
Dimensions: 
With Case: 38 x 22 x 14mm
Without Case: 35 x 19 x 10mm
 
Note: Crystals not included. These receivers are compatible with single-conversion receiver crystals. Standard dual-conversion crystals will not work with these units.