“Headset for Batteryless telephone no name (See sound power telephone 4).
Type Batteryless telephone: KS-1 (See sound power telephone 1).
Augmented: 24V
Maker: Liaxing Kexun Electron Co.,LTD
PLs see attahed photo
Headset has father plug with 7 pin contacts. (See sound power telephone 3).
Batteryless telephone has mother plug with 7 pin contacts (See sound power telephone 2).” HEADSET FOR BATTERYLESS TELEPHONE LIAXING KEXUN ELECTRON.NA.NA