Fitbit is going after the big fish with its all-new range of health-tracking wearable devices in an affordable package.

Fitbit, the maker of affordable range of health and fitness tracking wearables, is taking on big companies like Apple by introducing three new devices. The new products, which include Fitbit Charge, Fitbit Charge HR and Fitbit Surge, are much in line with the company's feature-packed range of devices capable of tracking activity, sleep and also pair with smartphones to provide a detailed graph chart of a wearer's health.

Fitbit's latest products are designed to meet the requirement of various customers, both in terms of specs and price. The base model is the Fitbit Charge that sports a wide range of features including tracking steps, distance, burnt calories, quality of sleep, workouts and more. The design features a trendy look with a textured wristband and an improved clasp for better comfort. The 7-day battery will help users track health consistently.

Fitbit Charge is also capable of pairing with smartphones to show incoming calls in a small OLED display, where info such as time and real-time stats are displayed.

Fitbit Charge HR is a mid-range wearable with extended features. The device sports an always-on heart rate monitor to get accurate data on the calorie burn, workout intensity and more. In addition to all the Fitbit Charge's features, the Charge HR features PurePulse heart rate technology that uses LED lights to detect blood volume changes. The battery lasts about 5 days, which is still better than smartwatch's standard 1-2 days of battery charge. It features a similar design like the Fitbit Charge and will be available early next year.

Finally, Fitbit announced the Surge, the high-end smartwatch and the most advanced tracker built by the company to date. The wearable sports a completely new look and packs 8-sensor technology for advanced tracking. Referred to as "Fitness Super Watch," the Surge has a built-in GPS tracker, 3-axis accelerometers, gyroscope, compass, ambient light sensor and heart rate sensor. It has a bigger display compared to Charge and Charge HR, which is useful for various smartwatch functions like Caller ID, text alerts and mobile music control.

Despite the high-end features in a smartwatch, Surge manages to survive up to 7 days on a single charge, "so you can track a work week or a marathon on just one charge," Fitbit said in the company's official blog post, Monday.

The Fitbit Charge is available online and in retail stores in the U.S. for $130. Available in black and slate colors, Fitbit has promised to add blue and burgundy to the range soon. The Fitbit Charge HR and Surge are expected to hit the stores early next year, around the same time when Apple is likely to launch its coveted Apple Watch. The Charge HR will sell for $150 with black and plum color options at the launch while the Surge will retail for $250 in a black variant. Both late entries will get blue and tangerine hues at a later time, the company said.