Sennheiser CX 400BT Black True Wireless In-Ear headset headphone - bluetooth 5.1
up to 7 h running time
up to 20 h with charging case, SBC, AAC, aptX Codec compatible 
dynamic 7 mm drivers
max. spl 107 dB SPL (1 kHz / 1 mW) 
frequency response: 5 -21000 Hz
customizable touch control 
works with Google Assistant and Apple Siri
weight of single earphone 6g
includes charging box
charging cable and silicone ear tips (XS/S/M/L)
colour black