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Bluetooth protocol: Bluetooth Specification V4.0 BLE, send and receive no byte limit,open environment and iphone 4 s can achieve 110 meters extreme distance communication.
The DFRobot 4WD mobile Platform is intended for use with the DFRobot ROMEO All-in-one Controller and includes 4x motors, 4x wheels and a complete chassis with mounting hardware. The included second level allows you to add more electronics and define a modular layout. The rectangular hole allows for a servo to be attached and be used for several purposes like a movable camera or a robotic arm. The high-strength aluminum alloy body material provides flexibility in rapid movement particularly in outdoor grass, gravel, sand or sloped surface. Increased life span of the electronics and gears due to the chasis study structure. The 4WD Arduino Mobile Platform is also suitable for robot competitions and research related projects.