[Compatibility] The armrest can fit square or rounded sofa armrests with a width over 4.3''. The range of the charging coil is 3-9mm from the surface. At this range, the charging response time is 0.1s with a charging efficiency above 75%. The cable has a length of 5 feet. [High Safety Standards] The wireless charger has built-in overheat cut-off mechanisms and short circuit protection. The wireless charger is certified by numerous international agencies including CE and FCC. [Fast Wireless Charging] The charger is compatible with iPhone 8-14, Samsung Galaxy Z Flip, Fold, Galaxy Note20, S6/S7/S8/S9/S10/S20/S21/S22 Series,. [Natural Matrial] The bamboo is sourced from a small family-farm in Fujian Province, China. Different batches will have color differences. Each piece of our bamboo is hand picked to ensure aesthetics and uniqueness. The bamboo is then smoothen and painted with food-grade coating to ensure durability and smoothness. We rounded all edges of the armrest tray. [Multi-Functional Design] The armrest tray can turn your rounded sofa arms into a functional side table. And can be used to put laptops and tablets when you are working from home or relaxing at home. It has a silicon coaster to secure your glasses and mugs. The wireless charger can top off your phones and earbuds. The bottom of the tray has a dotted surface to prevent the tray from slipping off the armrest.