SONR Coach Receiver Bone Conduction Underwater Swim Audio Unit, Expansion Receiver Coach Radio System, Waterproof Swim Coaching Headphones - Receiver Only (Blue)

["[Receiver Only Requires SONR Coach Radio Transmitter] This product includes one SONR Coach receiver only. It does not work independently and requires a SONR Coach radio transmitter to receive voice instructions. Ideal as an expanding unit to an existing SONR Coach system.","[Compatible with Common & Private Channel Coaching] When paired with a SONR Coach radio transmitter, the receiver supports common and private channel communication, allowing coaches to broadcast to groups, address individual swimmers, or work with sub-groups during training sessions.","[Designed for Comfort] The receiver can be worn under a swim cap or attached to goggle straps. Its lightweight design makes it suitable for kids, teens, and adults. For best sound clarity, the use of earplugs is recommended.","[Bone-Conduction Technology] SONR uses bone-conduction technology to transmit sound directly to the swimmer’s inner ear, ensuring clear audio even underwater. Unlike conventional waterproof headphones, SONR does not require earbuds or Bluetooth, providing reliable performance in demanding training environments.","[Easy to use in Pools & Open Water] SONR Coach’s receiving range is up to 984 ft (300 m) in open water, up to 164 ft (50 m) in pools, and up to 3 ft (1 m) in depth. Both receivers and transmitter are fully rechargeable, making the system suitable for regular team training.","Important! This is a receiver only. A SONR Coach radio transmitter is required for operation. SONR Radio transmitter is included in Basic and Dual Sets."]