The Hubsan X4 is a series of very small lightweight remotely-controlled quadcopters (sometimes considered unmanned aerial vehicles or "drones") which utilize four propellers (hence the "X4" designation) powered by a single lithium-polymer battery. Since the marketing of the first model, several upgrades and improvements have taken place, each with a subsequent model number and designation.
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H107
The H107 was the first model. All subsequent models are based on this basic design. Like all Hubsan X4s, the H107 operated with four propellers and a lithium-polymer battery. It was very inexpensive compared to the available set of quadcopters, making it appealing to first-time hobbyists and therefore very popular. However, it had no built-in LED lights, no camera, was easily damaged when crashing, and could easily blow away in light winds.
H107L and H107P
The H107L was the next Hubsan X4 model. It included a set of four LEDs on the ends of its four arms (hence the "L" designation), allowing the operator to determine its facing direction even in daylight settings. It also was given shorter blade axles on its propellers to help stabilize flight. It was eventually re-designated H107P (for "plus", though not with the same meaning as the plus symbol, "+", about which see below).
H107C
The H107C included a 720p digital on-board camera, allowing the user to record flights onto a micro SD card and then download the recordings to a computer for viewing. The plus model, H107C+, while still being equipped with the same 720P camera as its predecessor, was given an altitude hold mode, allowing it to maintain a given altitude without further input from the controller. The plus version also included screws along the undersides of the arms to prevent the arms from popping open which was a frequent problem in previous models. Upon its release, it was recognized as the smallest publicly-available "drone" to contain a camera.
H107D
The H107D was the first Hubsan to have a first person view. It retained the same 720P quality as the H107C, but broadcast it to a video screen on the controller so that the pilot of the craft could see what the craft was "seeing" in real-time. During the 2015 CES Show, the Hubsan X4 H107D Plus (+) was unveiled to the public as the next generation of Hubsan's flagship line. The H107D+ also had the altitude mode upgrade.
H109
The H109 included a set of brushless DC electric motors with a larger transmitter to harness the resulting power. It also purported to have a 20-minute flight time, which is nearly three times longer than most of the previous models. It did not come in a "plus" variety (there is no H109+) which meant that it lacked the altitude hold function.
H109S
The H109S, also called the Hubsan X4 Pro, featured a 1080P HD camera and GPS return-to-home function as well as a built-in parachute. These last two characteristics are intended to help prevent the unit from becoming lost or damaged, both chronic problems in earlier models.
H111
The H111, also marketed as the "Q4 Nano" quadcopter, is the smallest quadcopter Hubsan manufactures: it is about 45 mm on a side (excluding propellers), and weighs 11.5 grams. Marketed as more of a toy than other models, it includes few of the features of other Hubsan quadcopters: although it does have the LED lights for orientation, there is no camera, no altitude hold, and it has only a five-minute flight time per charge (battery is built-in and must be charged with a USB cable for 40 minutes to obtain a full charge). Also, unlike most other Hubsan models, the H111 has no pre-designed propeller guard, which means the propellers are more exposed and likely to be damaged in a crash.
H501S
The H501S, also marketed as the "Hubsan X4 FPV brushless" quadcopter, has 20 minutes' flight time, first-person view (FPV), altitude hold, follow-me mode, and auto return home.
H501A
The H501A, also known as the 'X4 Air Pro' has a Flight time of 20 minutes, it uses a battery 7.4V 2700mAh Li-Po and has a charging time of 210 minutes. Total fly distance 300 meters. APP compatible/orbiting/functional waypoints. FPV: Real Time Photo/Video Transmission. 4 Brushless Motors. HD camera resolution 1920 x 1080P. Flight Control Failsafe and Low Power Failsafe. GPS/Follow Me/Headless/RTH/Automatic Take-Off.
H507A
The H507A, also known as the X4 Star Pro is APP compatible and let you set the waypoints on the map to photography easier. Is has a 720P High Definition Camera. GPS Accurate Position. Automatic Return To Home. Flight Time 10 Minutes. Battery- 7.6V 550mAh Li-Po. Charging Time- 200 minutes. Distance- 300 meters(with Relay). APP Compatible/Orbiting/Functional Waypoints. Real time FPV/Photo/Video. 4 Coreless Motors. Flight Control Failsafe/Low Power Failsafe. GPS/Follow Me/Headless/RTH/Automatic Take-Off.