Block Diagram

1 2 3 4
A
B
C
D
4321
D
C
B
A
IC
DC 4V5
2G4 Power
Circuit
Supply
Keyboard
Cirucit
Sound
Circuit
X2457
2G4
Filtering
Circuit
(Embeded 2G4)
BUZZER
MICROPHONE
Filtering
Audio
Processing
Circuit
Crystal
Circuit
12MHz
(Talk)
2406.65MHz~ 2480.65MHz
ANT