DUAL BATTERY SYSTEM: The NB4 is equipped with 2 batteries, one in the handle and one removable power bank in the base. The base will charge the battery in the handle when connected and when disconnected the power bank can be used to charge other devices using its USB output. ERGONOMIC DESIGN: Our ergonomic steering wheel design gives you more options than ever before. Find a position that's comfortable for you, sitting, standing, or leaning.Specification: Product model: NB4 Product name: Nobel Channels: 4, 6, 8 (optional firmware options) For Model: Car, boat Wireless frequency: 2.4GHz Transmission power. 300m (ground) Channel resolution: 4096 Battery: 1S (4.2V) 4300mAh lithium polymer battery + 2600mAh dual battery Charging port: Micro USB Charging time: base. Product model: FGr4 PWM channel: 4 Wireless frequency: 2.4GHz Wireless protocol: AFHDS 3 Range:> 300m (ground) Antenna type: single antenna (150mm) Power: 3.5-12V RSSI: Supported Data port: PWM / PPM / i. Humidity range: 20% -95% Online Update: Yes Dimensions: 45 22 16.2mm Weight: 15g. Product Model: FGr4S PWM channel: 4 Wireless frequency: 2.4GHz Wireless protocol: AFHDS 3 Range:> 200m (ground) Antenna type: Built-in single antenna Power: 3.5-8.4V RSSI: Supported Data port: PWM / PPM / i. Humidity range: 20% -95% Online Update: Yes Dimensions: 26 22 17.3 mm Weight: 5.1g. To avoid the 2.4Ghz radio signal interference. Please always keep your model in sight and within 300m and make sure there are no other signals around, cause they may block the RF signal and lead to loss of control. Never grip the transmitter antenna during operation. It significantly degrades signal quality and strength and may cause loss of control. Package information: Package list: 1Noble Transmitter; 1FGR4 receiver; 1FGR4S receiver; 1USB cable; 1 accessories kit Package size: 272318cm Package Weight: 1800g. Choose us, a good life begins! This item is in the category "Toys & Hobbies\Radio Control & Control Line\RC Model Vehicle Parts & Accs\Control, Radio & Electronics\Receivers & Transmitters". The seller is "newgaga" and is located in this country: US. This item can be shipped to United States.