**Specifications:**

**Upgrade Comparison:**

- **Version:** K38, K39, K40, K41

- **Features:** High-definition sound quality, automatic frequency tracking, long-distance range

- **Microphone Advantage:** Metal U-segment adjustable frequency, anti-interference, anti-howling

- **Battery:** Large capacity No. 5 batteries

- **Range:** ≥50m (K38), ≥60m (K39), ≥80m (K40), ≥100m (K41)

- **Additional Features:** Lithium rechargeable batteries, built-in receiver, anti-howling, clear sound quality

**SANSUI WK Brand Information:**

- Founded in 1978, specializing in audio technology

- Serving over 10,000,000 users globally as of August 1, 2022

- Commitment to quality and customer service

**Troubleshooting:**

- **Issues:** Fatigue from incorrect microphone selection, distortion, severe howling, noise interference

- **Solution:** SANSUI Wireless Microphone Series offers improved performance and high-fidelity sound quality

**Wireless Microphone Features:**

- Dynamic coil core for high-fidelity sound

- Intelligent noise reduction and anti-howling technology

- Rechargeable battery with anti-drop mesh cover

- Improved sound quality and noise reduction compared to previous models

**Compatibility:**

- Suitable for various devices including amplifiers, projectors, sound cards, buses, and more

- Easy connectivity with digital screens for visual frequency tracking

**Additional Details:**

- Metal anti-drop mesh cover for durability

- Clear digital display for battery, signal, and frequency information

- Ergonomic design for comfortable grip and versatile use

**Application:** Ideal for stage performances, karaoke, and other entertainment settings

**Frequency Range:** 655.0MHz, 48V, suitable for multiple users without interference

**Package Includes:** Wireless microphone, receiver with digital screen, and easy-to-use features

**Note:** Some devices may require a 3.5mm adapter for connectivity

**Brand Guarantee:** SANSUI ensures quality products with a focus on user experience and performance.