This is a one-unit relay type receiver.

• Power Usage: DC24V (DC 19-28V)
• Usable at AC 100-240V with an optional AC adapter
• Includes a diversity antenna that provides stable communication
• Light and compact: weight 250 g (8.8 oz), external dimensions
  (W × H × D) 8 × 10 × 3 cm (3.1× 3.9 × 1.2″)