Here is an economical unit you can fly inside as well as outside.

The Large Metal Gyro RC Helicopter has a single rotor which enables you to fly faster and be more agile in the air. The gyro auto-stabilizes during flight.

There is a 4 Channel 2.4GHz transmitter with LED screen which operates on six “AA” batteries (not included).

The helicopter battery is a rechargeable 7.4V 800mAH Li-poly unit. With only a one hour charge you can fly for 6-8 minutes.

You can control this chopper from up to 130 meters.

Should you have an unexpected sudden stop either outdoors or indoors, this model comes with a spare main blades and tail blade.

It may have only a single rotor but it can still fly left and right, forward and backward, upward or downward and side-to-side.

This is a very economical RC helicopter which will give you hours and hours of enjoyment. 

Features
4 Channel 2.4GHz transmitter
Gyro auto stabilizes during flight
Single rotor will enable you to fly faster and be more agile in the air
For indoor use, but the single rotor design also enables you to fly outdoors
 

Specifications:

Functions: left/right, forward/backward, upward/downward, side-to-side
Charging time: About 60 minutes
Flying time: About 6-8 minutes
Controlling distance: About 130 meters
Product Size: 16" x 3.25" x 6.25"
Helicopter Battery: 7.4V 800mAH Li-poly
 

Includes:
4Ch V912 Single Rotor Helicopter
2.4Ghz Remote Control with LCD screen
Charging adapter
Spare Main Blades and Tail Blade
7.4V 800mAH LiPo Battery
Instruction Manual
 

Required
(6) AA batteries for Transmitter (not included)