Wireless transmitter and receiver set for electro-acoustic musical instruments such as guitar, bass, etc. Made of plastic, durable and reusable for a long service life. Comes with a USB cable, built-in 700 mAh lithium battery. Plug and play, easy to use, easy to carry. Delay time within 4 mS gives you a good music experience. M7 is suitable for electric guitar. UHF original sound transmission, anti-interface and ultra-short delay. Delay time within 4 mS gives you a good music experience. M7 is suitable for electric guitar. Comes with a USB cable, built-in 700 mAh lithium battery. Plug and play, easy to use, easy to carry. Main Material:Plastic,Metal Colour: black. Part size: approx. (L x W x H) 11 x 4.5 x 1.5 cm. Gross weight: approx. 130 g. Note: 1.1 inch = 2.45 cm / 1 cm = 0.393 inches. 2. Please allow 1-3 cm error due to manual measurement. Please make sure that this is not a problem for you before purchasing. 3. Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Thank you!