This insanely tiny 2.4GHz diversity receiver available is the next big thing in miniaturization of racing craft. Weighing in at under 2g, this receiver is perfect for those racers who are looking to lower their AUW. These are rated to "full range", so identical to your X4R and D4R setups.

Specifications;

• Compatibility: FrSky D16 mode
• Dimension: 21.5*12*3.5mm(L x W x H)
• Weight: 1.6g
• Operating Range: Full range
• Operating Voltage Range: 3.7V~10V
• Operating Current: 30mA@5V
• Number of Channels: Up to 16CH from SBUS(CH1~CH15 for PWM,CH16 RSSI for FC)