High volume, good sound quality, good sound reduction Loudspeaker howling is well controlled Support stereo reverb, good reverb effect Colour: Black Material: Metal + ABS<br><br>TR619 Amplifier Digital Player Frequency Range FM:87.5-108MHz TF /USB USB supports up to 64G, TF card supports up to 32G USB output 5V-0.15A Speaker 2ohm 5W Power 5V-0.6A Antenna length 395mm battery capacity 1500mAh Dimensions 87x129x46mm Weight About 221.7g TR503 Wireless microphone Frequency Response 87MHz~108MHz Max Output power 1MW Lithium battery 250mAh Charging Voltage DC 5V, 1000mA Working time 8~12 hours Charging time Less than 4 hours Product Size 116 x 86.6 x 40.7mm<br><br>Package Contents: 1 x TR619 Amplifier Digital Player 1 x AUX audio cable 1 x Headset microphone 1 x 1.2m strap 1 x Back buckle 1 x USB power cable 1 x User Manual<br><br>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.