How to know a bluetooth headset is ANC headphones?

Real ANC headphones has an ANC button on headphones

Just like our ANC804 as below

JH-ANC804 Gaming Headphones Bluetooth is a 2 in 1 headset can be used Wireless bluetooth or Wired with a 3.5MM Audio Cable

Bluetooth Chip: CSR8635

4.2Version Support: A2DP, HFP, HSP, AVRCP

Working Distance: up to 10 meters

Speaker Diameter: 40mm

Speaker Impedance: 32ohm±15%

Speaker Frequency Range: 20Hz-20KHz

Sensitivity: 119±3dB

SNR: -92dB

Battery Capacity: Rechargeable 3.7V / 400mAh lithium-ion battery

Working Time: about 10 hours (Bluetooth + ANC); 20 hours (ANC); 20 hours (Bluetooth)

Charging Time: about 3 hours

Charging Port: Micro USB

Charging Voltage: DC 5V

Interface: 3.5mm

Color: Black

ANC headphone Size: Approx. 19.8 * 16.3 * 8.0cm / 7.79 * 6.41 * 3.14in

Bluetooth headphone Weight: 210g / 7.41oz

Package Size: About. 21.5*19.5*5.5cm / 9.05 * 8.26 * 2.36inch

Package Weight: 455g

Package content:

1 * ANC Bluetooth Headphone

1 * USB Charge Cable

1 * 3.5mm Audio Cable

1 * Multi-language User Manual, there are Spanish,Germany,English,Janpanese,France and Italian 6 languages