Ibanez S521 guitar inside

 Ibanez S521 guitar

Inspector Mirage headless guitar - travel bridge

 Inspector Mirage headless guitar - travel bridge inside

Watch battery (Wenger)

371 - 9,5x2mm, 1,55V, 35mAh (V371, D371, 280-31, SB-AN, SR921, SR69, SR920SW)
370 - 9,5x2mm, 1,55V, 40mAh (V370, D370, 280-51, SB-BN, SR921, SR69, SR920W)

FX Audio FX-01 USB Sound Card inside

FX Audio FX-01 USB Sound Card Audio Decoder SA9023 + PCM5102 DAC from https://www.ebay.com/usr/thanksbuyer-hobby

CSR8675 Bluetooth Receiver inside

 CSR8675 bluetooth receiver from https://www.ebay.com/usr/shenglongsi

Receiver supports LDAC audio codec but aptX HD did not. Wrong description by seller.

B1 Bluetooth receiver inside

B1 bluetooth receiver (QCC5125) from https://aliexpress.ru/store/911253348

It is supports hi-res audio codecs LDAC and aptX HD.

Gibson SG Special 2018 guitar inside.

Gibson SG Special 2018 

Inside

zombie epl-01 guitar heavy mod

zombie epl-01 guitar heavy mod.

origin front

origin back

wood ...?