1. One-click noise cancelling 2. One key to mute 3. CD sound quality 4. 40-hour long lasting battery life (with charging case) 5. Playback without unplug pass-throught charging 6. 200m transmission range 7. Supports external microphone 8. 360 degrees omnidirectional sound pickup 9. Plug and Play Specifications: Wireless transmission: 2.4GHz adaptive frequency hopping Polar pattern: Omnidirectional Max sound pressure level(SPL): 112dB Sampling rate: 48KHz type of battery: LiPo battery Microphone frequency response: 20Hz-20KHz Charging time: TX: 1.5 hours, charging case: 2 hours Endurance: TX: 7 hours, charging case: simultaneously charge 2 TX for more than 4 times Input dynamic range: 87dB Transmission range: 50m (free movement), 200m (LOS) Bit depth: 16bit Size: TX: 52.5x25x10mm 15g, RX: 48x28.2x9mm 7.2g, charging case: 94x63x31mm Packaging list: 2 RX + 2 TX: Type-C receiver x 1, 8-pin receiver x 1, transmitter x 2, charging case x 1, windproof fur x 1, data cable x 1, storage box x 1, user manual x 1 Type-C RX + 2 TX: Type-C receiver x 1, transmitter x 2, charging case x 1, windproof fur x 1, data cable x 1, storage box x 1, user manual x 1 8 Pin RX + 2 TX: 8-pin receiver x 1, transmitter x 2, charging case x 1, windproof fur x 1, data cable x 1, storage box x 1, user manual x 1 Type-C RX + 1 TX: Type-C receiver x 1, transmitter x 1, windproof fur x 1, data cable x 1, storage box x 1, user manual x 1 8 Pin RX + 1 TX: 8-pin receiver x 1, transmitter x 1, windproof fur x 1, data cable x 1, storage box x 1, user manual x 1Specification: Package Weight One Package Weight 0.30kgs / 0.67lb One Package Size 12cm * 8cm * 14cm / 4.72inch * 3.15inch * 5.51inch Qty per Carton 60 Carton Weight 18.00kgs / 39.68lb Carton Size 48cm * 40cm * 42cm / 18.9inch * 15.75inch * 16.54inch Loading Container 20GP: 330 cartons * 60 pcs = 19800 pcs 40HQ: 767 cartons * 60 pcs = 46020 pcs