1. Unique and innovative structure design2. Durable and light weight design for wearing comfort3. Using point to point technology4. Effective distance for 40 metersTransmitter:* Radiate frequency: FM 49.85MHz * Radiate power: max. 120dB * 6F22 (9V) battery, or used AC/DC adapter * Audio input: ≤500mV Headphone: * Receiver frequency: FM 49.85MHz * Audio frequency response: 80Hz - 15kHz (+/-3dB) * S/N: ≥45dB * Out put power: ≥50mW * Receiver distance: ≥40 meters (none impediment)
