Silvercrest STSK 2 D4 Operation And Safety Notes page 18

Storage
temperature
Dimensions
Weight
Notes on Qi technology:
This product with wireless Qi charging
technology is designed to comply with the Qi
(Wireless Power Consortium) standard, but no
guarantees are given for its compatibility with
all products that comply with the standard .
The specification and design may be changed
without notification .
18 GB/IE/NI
0 to +40 °C
approx . 40 x 17 x 18 mm
(headphones)
approx . 53 x 52 x 28 mm
(charging box)
approx . 10 g
(both headphones)
approx . 39 g
(charging box)