2.5" LCD screen receiver and 4 COMS Cameras
RC820A (receiver):  
-LCD: 2.5'' TFT
-Definition (dot): 480 x 234
-View Angle (U/D/L/R) (CR>10): 10 / 30 / 45 / 45
-Receiving Frequency: 2.414GHz, 2.432GHz, 2.450GHz, 2.468GHz
-Middle Frequency: 480MHz
-Sensitivity: -80dBm
-TV System: PAL/NTSC Automatically Change
-Battery: Built-in 7.4V Lithium Battery
-Low Voltage leading to turn off: Lithium battery lower than 6.5V leading to
  turn off automatically
-Power: DC12V/1.5A
-Power Consumption: ≤3W
-Working Temperature: 0~60ºC
-Unit size: 123*72*24mm
-Weight: 200g
Accessories:
-Switch Power Adapter: 1PC (INPUT: AC 100~240V 50/60Hz; OUTPUT: DC 12V/1.5A)
-AV cable (Four Head): 1PC
-Manual: 1PC
-Camera: Optional (1 ~ 4PCS) + Switch Power Adapter (1 ~ 4PCS)
-Car Wire: 1PC
-Earphone (Double Track) 32Ω: 1 PC
-Strip for Mobile Phone: 1PC
-Flannelette Cover: 1 PC    
-Packing: 20pcs in a carton.
CM220CWAS:
Technical Specification:
-Transmission/Receiving frequency: 2.4GHz
-Transmission power: 10mW (TX2400)
-Open distance: 50-100meter
-Horizontal definition: 380 lines
-TV system: PAL/NTSC
-Video picture: CMOS Color with Audio
-Power adapter (Camera): DC12V 500mA
-Size: 56*60*45mm
-Packing: 40pcs/ctn (43*33*45cm)