public function getDevices()
    {
        $devices = array();
        foreach ($this->getChatMembers() as $chatMember) {
            /* @var $chatMember User */
            // Devices to Array
            $devicesObject = $chatMember->getDevices();
            foreach ($devicesObject as $do) {
                $devices[] = $do;
            }
        }

        return $devices;
    }