The new SoundPEATS Engine 4 are Bluetooth headphones that have good sound quality thanks to their dual drivers. In addition, this model is compatible with the LDAC codec and Hi-Res sound certification. All of this also has a low latency mode. Features: Powerful sound with its dual drivers: - The SoundPEATS Engine 4 delivers powerful sound thanks to dual 10mm and 6mm drivers. These provide a frequency response of 20 to 40 Hz. This model also supports the LDAC codec and is Hi-Res audio certified. Low latency mode and Bluetooth connection: - These new SoundPEATS headphones will connect to your smartphone via their Bluetooth v5.3 connection . In addition, they have a low latency mode for use while playing on your smartphone with a speed of up to 70 ms. They can be used when doing sports: - All this while the SoundPEATS Engine 4 is IPX4 water resistant. This means that they can be used for sports as they are sweat and water resistant. Up to 43 hours: - The Engine 4 has a built-in battery and a charging box. The headphones´ built-in battery lasts up to 12 and a half hours per charge; and with its charging box, it can last up to 43 hours of use. Specifications: Sound: - Dual drivers: 10mm + 6mm - Frequency response: 20-40 kHz Wireless connection: - Bluetooth v5.3 - WQ 7033MX Bluetooth Chip - Codec: LDAC - Audio Certification: Hi-Res Features: - 70ms low latency mode - Connection with multiple points - IPX4 water resistance Battery: - Capacity: 50mAh (Earphone)/350mAh (Charging box) - Use time: up to 12.5 hours (Charging) / up to 43 hours (Charging case) - Charging time: up to 1.5 hours - Charging via USB Type C - Dimensions: 6.14 x 2.8 x 4.5 cm - Weight: 139 gr Box contents: - SoundPEATS Engine 4 Headphones Black (Left and Right)- 2x - 1 x Charging Box 1x - USB Type C Charging Cable 1x - Pairs of ear adapters (S, M, L) 3x - User manual 1x