Portable Battery Operation:Conveniently powered by batteries, ideal for on-the-go audio testing. Auto Power Off:Energy-efficient with an auto power off feature after 15 minutes of non-use. Data Hold & Timer Function:Includes a data hold function and a 30-second timer for precise measurements. Versatile Test Ranges:Features 20/200/2000 test ranges, catering to both home theater and commercial sound systems. Surround Sound Tester,Empower Checking,True 1KHz Measurement:Accurately measures speaker systems' impedance at 1KHz for precise audio tuning. Colour:Yellow Material:plastic Package Contents: 1 x Resistance Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.