Product Features: This wireless speaker charger offers robust protection, excellent anti-interference performance, high reliability, high efficiency, low operating temperature, and long service life. The input voltage range is 100-240V, which complies with global standards. It features excellent insulation and high dielectric strength. It also has short-circuit, overload, and over-voltage protection. Product Specifications: Material: ABS; Color: Black; Input Voltage: 100-240V; Optional Types: US Standard Plug Speaker Power Adapter; European Standard Plug Speaker Power Adapter; UK Standard Plug Speaker Power Adapter; Compatible with the following Harman Onyx Studio 7: HKOS7BLKAM; Onyx Studio 6: HKOS6BLKAM; HKOSBLUAM; HKOS6; HKOS6GKYAM; HKONYXS2BLKJK; Onyx Studio 5: HKOS5BLKAM; HKOS5BLUAM; HKOS5GRYAM; Onyx Studio 4: HKOS4BLKAM; HKOS4BLUAM; HKOS4WHTAM; HKOS4BLKBSG. HKOS4BLKEU; HKOS4WHTBSG; HKOS4BLUBSG; Onyx Studio 3: ONYXSTUDIO3R; HKONYXSTUDIO3BLKUS; ONYXSTUDIO3REDG1; ONYXSTUDIO3K; ONYXSTUDIO3BLUEG1; HKONYXSTUDIO3BLKAM; Onyx Studio 2: ONYXSTUDIO2BLKUS; Onyx Studio 1: HKONYXSTUDIOG1; HKONYXSTUDIOJN; Note: Please allow 1-2 cm error due to manual measurement. Please make sure you do not mind before placing an order. Due to differences in different monitors, the picture may not reflect the actual color of the product. Package Includes: 1 Power Adapter