Wireless Bluetooth Serise Connection:TWS function lets you pair 4 speakers for a powerful surround sound.(the HOST speaker and SUB speaker will automatically link with each other within 6 seconds after you turn on both, simple and easy to use) | 100FT RANGE:Advanced 5.0 ensures more stable and instant pairing compared to 4.2 and lower; maintains a strong connection up to 100 ft unobstructed away from your device; 3.5mm aux in jack for connecting devices | Flush Mount DesginCompact flush mount design for simple easy installation in-wall / in-ceiling , or pre-cut speaker openings, for in home use, office, professional, or custom audio applications on any flat surface. | Dimensions: Total Speaker Diameter: 6.4 Inch Cut Out Diameter: 5.7 Inches Total Speaker Depth: 2.6 Inches Mounting Depth: 2.6 Inches | 100% CUSTOMER SATISFACTION 1 YEAR WARRANTY: We pride ourselves in ensuring customer satisfaction. Herdio provides Lifetime Support with our Professional Customer Support team. If its a technical question or a basic question well be more than happy to help!