EAS RF DSP control board HL4900 
Specifications:

Processor:DSP
Power Input: 24V DC 0.8A       

Center Frequency:8.2MHZ(10.2MHZ/4.7MHZ optional)  

Sweeping Frequency: 7.7MHZ~8.7MHZ  

Modulation Frequency: 150HZ/160HZ/170HZ,default is 180HZ

Detection Distance: Hard Tag: 1.2m-1.8m Soft Label: 70cm-100cm
Size: 19.0*15.0cm (TX),19.0*15.1cm (RX)
Weight: 0.30kgs/set
Packing: 500 pcs/carton,0.035 CBM
Application: All kinds of RF antennas 
Features:
1.Brand new components
2. Fast alarm speed and strong anti-interference
3. Long aging time and load aging
4. Delicate appearance and easy installation
5. Completely SMD mounted