just seems relevantly cheap, worth for a gift for kids.
Technical Specs
Box Contents: Earphones, Ear adapter set (XS/S/M/L), USB-C charging cable
Microphone: MEMS, omnidirectional
Sound pressure level (SPL): 112 dB (1 kHz/0 dB FS)
THD, total harmonic distortion: 0.5 % (1 kHz, 100 dB SPL)
Transducer principle: Dynamic
USB Standard: Type C
Battery time: 10 h, SBC
Supported Profiles: A2DP, AVRCP, HSP, HFP
Bluetooth Version: 5.0
Codecs: SBC, AAC
Ear coupling: ear-canal
Ear pad material: Biocompatible Silicone
Frequency response: 17 – 20.000 Hz (- 10 dB)
Impedance: 28 Ω
Weight: 12 g
OzB posts (2022)
https://www.ozbargain.com.au/product/sennheiser-cx-350