Transimitter: 1) frequency: 84MHz 2) modulation mode: FM 3) transmission range: 35 meters 4) power supply: 2xAAA or 4.5V adaptor Receiver (headphone): 1) frequency range: 82-108MHz; 2) reception mode:FM 3) frequency response: 20-20000Hz 4) distortion: ≤2% 5) power supply: 2*AAA batteries. Main Features: 1.Wireless and Wired Listening Function; 2.FM Radio; 3.Wireless talking on internet; 4.Fashionable Colorful Case. 5.LED super shining light (optional) Packing: 1pc/color box; 20pcs/carton; Carton Size: 51*45.5*54 cm N.W./G.W.: 12.70 / 14.00 kg