This 23mm round speaker, model ESU-50332, comes with a sound chamber and has a 4-ohm impedance. Part number is 397-50332, suitable for all scales. It offers great sound quality in a compact size.

Using this speaker is easy. First, make sure your device can support a 4 - ohm speaker. Connect the speaker to your device following the standard connection methods. When using, keep it away from moisture and extreme temperatures. For maintenance, you can gently wipe the speaker with a dry cloth to keep it clean. Don't apply too much pressure on the speaker cone to avoid damage. With proper use and care, this speaker will serve you well for a long time.