HT28410 Hitec "Optima 6" 6 Channel 2.4GHz Receiver 

Adaptive Frequency Hopping Spread Spectrum Technology (AFHSS): The Optima 6 utilizes Hitec's AFHSS 2.4GHz technology and Hitec's exclusive Smart Scan system to ensure a rock solid, interference free connection. When selected, Hitec's 2.4GHz SmartScan function scans the 2.4GHz spectrum to find the cleanest channels in which to operate, therefore providing interference free operation even in the most crowded environments.

Single Boosted Omni Directional Antenna (BODA): The Optima 6 receiver features Hitec's exclusive BODA receiver technology. Independent testing has proven that the single BODA antenna system in Hitec's 6 channel system is equal to or better than Hitec's competitor's dual antenna systems.

Supplementary Power Connection (SPC): With Hitec's Supplementary Power Connection you can eliminate "brown out" concerns by powering the receiver independently of the servos. 

Features:

• Single Boosted Omni-Directional Antenna (BODA) System
• SmartScan Mode Selectable
• Low Battery Warning Telemetry Function
• Fail-safe/Hold Function  
• Upgradable Firmware

Specifications:
Modulation: 2.4GHz AFHSS
Dimensions: 1.84x0.84x0.45" (46.74x21.34x11.43mm)