The Magic Sway P705B 3.5CH GYRO Electric IR RTR RC Helicopter is one of the newest helicopters to come out.
This is built into the K4020U MOSFET amplifier in order to display amplifier power output. The meters are mounted behind the correct scale which is also illuminated according to the speakers connected to the amplifier (4 or 8 ohms). When the amplifier is switched into a bridge configuration then both meters may be connected in series.
Cessna 182 Battery - One Battery - 8.4V 1000mah