1. Minimalist geometry design, anti - jamming dual capacitor microphone. 2. 360 - degree pickup, the sound is clear, great receive distance. 3. Compatiblity: Not only for the PC, but also compatible for smart phones. 4. Clip on design: full 360 degree effective receive mode, specially designed for voice recording. 5. Applications: Applies to private interview, recording dedicated, dedicated camera, conference dedicated.Specification: General Model R977 Material Aluminum Alloy Sensitivity -30dB+/-3dB Frequency Range 20hz-18khz Impedance <=2.2 k ohm Operation Voltage 1.5V Package Weight One Package Weight 0.11kgs / 0.24lb One Package Size 10.2cm * 10.1cm * 4.3cm / 4.02inch * 3.98inch * 1.69inch Qty per Carton 80 Carton Weight 7.80kgs / 17.20lb Carton Size 45cm * 42cm * 24cm / 17.72inch * 16.54inch * 9.45inch Loading Container 20GP: 587 cartons * 80 pcs = 46960 pcs 40HQ: 1364 cartons * 80 pcs = 109120 pcs