Specifications: Transmitter Brand Name: FlySky Item Name: FS-i6s transmitter Channel: 10 Model Type: Quadcopter Channel resolution: 4096 steps Low voltage warning: less than 4.2v ANT length: 26 x 2mm( dual antenna) Weight: 410g Battery: 6v 1.5 AA x 4(not included) Size: 179 x 81 x 161mm Color: Sliver Certificate: CE ,FCC RF specification: RF Range: 2.405 - 2.475GHz Bandwidth: 500khz RF Power: less than 20dBm RF mode: AFHDS 2A Modulation type: GFSK RX Sensibility: -105dBm Receiver: FS-IA10B: Number of Channels: 10 Suitable models: Airplane / glider / helicopter Health Frequency range :2.4-2 .48 GHz Number of newspapers: 160 Transmitting power: not more than 20dBm Receiver sensitivity:-105dBm 2.4G modes: automatic frequency second generation digital system Encoding: GFSK Antenna length: 26 mm * 2 (dual antenna) Weight: 19.3 g Input power :4.0-6 .5 V DC Dimensions: 47 * 33.1 * 14.7 mm Color: Black Certification: CE0678, FCC i-BUS Interface: Yes Data acquisition interface: Yes Features: Full touchscreen interface,more convenient to control Bidirectional Communication Capable of sending and receiving data,each transmitter is capable of receiving data from temperature,altitude and many other types of sensors,servo calibration and i-BUS Support. Multi-channel Hopping Frequency This systems width ranges from 2.4055GHz to 2.475GHz. This is divided in 140 channels. Each transmitter hops between 16 channels (32 for Japanese and Korean versions) in order to reduce interference from other transmitters. Omni-directional Gain Antenna The high efficiency Omni-directional high gain antenna cuts down on interference,while using less power and maintaining a strong reliable connection. Unique ID Recognition System