Transmitter Specifications:(FS-GT2) Channels: 2 Channels Model Type: car/boat RF Power: Less Than 20dbm Modulation: GFSK Code Type: digital Sensitivity: 1024 Low Voltage Warning:yes(less than 9v) DSC Port: Yes Charger Port: Yes Power: 12VDC (1.5AAA*8) Weight:328g ANT Length: 26mm Size: 159*99*315mm Color: Black Certificate: CE FCC Receiver Specifications (Model FS GR3B) channels:3 channels model type:car/boat frequency bank :2.4G modulation:GFSK sensitivity:1024 RF.receiver sensitivity:-100dbm power:4.5-6vdc weight:5g ANT lenth:26mm size:37.6*22.3*13mm color:gray semi-transparent certificate:CE FCC